If you spend your days welding, brazing, heating or cutting with oxy-fuel, your torch handle isn’t just another tool – it’s the part of the system you feel in your hand all day. The Cigweld COMET 3 blowpipe is designed exactly for that world: tough fabrication shops, onsite maintenance crews, and metalworkers who need one heavy-duty handle that can confidently switch between fine welding work and high-demand heating or cutting.
In this blog, we’ll take a deep dive into the Cigweld COMET 3 blowpipe, unpacking its technical specifications, valve design, safety features, accessories, and real-world applications. Whether you’re comparing handpieces for a new oxy-fuel rig or deciding if it’s worth upgrading from a lighter-duty handle, this guide will walk you through what makes the Cigweld COMET 3 blowpipe such a popular choice in workshops and site trucks.
What is the Cigweld COMET 3 blowpipe?
At its core, the Cigweld COMET 3 blowpipe is a heavy-duty oxy-fuel handpiece designed to handle a wide range of processes. With the right mixers and attachments, it can cover fusion welding, braze welding, soldering, heating, super-heating, hand cutting, sheet cutting, rivet cutting, powder facing and even flame cleaning in one versatile body.
The model typically referenced in industrial catalogs is the COMET 3 blowpipe handpiece with a 5/8"-18 UNF connection (part number 304001). That 5/8" UNF thread matches standard COMET regulators, flashback arrestors and hose fittings, making the Cigweld COMET 3 blowpipe a plug-in match for most Australian and New Zealand oxy-fuel setups that follow COMET or equivalent standards.
Unlike a basic lightweight torch handle, the Cigweld COMET 3 blowpipe is built as a robust, high-flow body that can support anything from small welding tips to serious heating barrels and cutting attachments. It sits at around 620 g in weight, giving it a solid, planted feel without being unmanageable. For many boilermakers and fitters, it becomes the default handle that lives on the bench or in the site kit.
With colour-coded valves for oxygen and fuel, left-hand and right-hand threaded hose connections for safety, and a contoured grip for comfort, the Cigweld COMET 3 blowpipe is designed to be intuitive, even for gloved hands in rough environments. What makes it unique, though, is the way its internal valve system delivers both fine control and high flow.
Key technical specifications of the Cigweld COMET 3 blowpipe
Before you decide if the Cigweld COMET 3 blowpipe fits your job requirements, it helps to look at the hard numbers and how they translate into day-to-day use. Here are the key technical details and what they actually mean for your oxy-fuel setup.
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Connection size: 5/8"-18 UNF
This is a common industrial standard, compatible with COMET regulators, flashback arrestors and hose fittings designed for 5/8" UNF. It helps the Cigweld COMET 3 blowpipe integrate smoothly into existing rigs. -
Fuel gas compatibility: multi-fuel via the appropriate mixer
With the correct mixer fitted, the blowpipe can be used with oxy/acetylene, oxy/LPG or oxy/natural gas. This allows a single Cigweld COMET 3 blowpipe to move between workshops or job sites that prefer different fuel gases. -
Weight (handle only): approximately 620 g
The weight contributes to stability when using larger heating tips and cutting attachments. The Cigweld COMET 3 blowpipe is light enough for everyday welding yet solid enough for higher-flow work. -
Valve design: two-stage “valve-in-valve” construction
This internal design gives a very sensitive low-end control for small flames and then opens up for high flow when required. It’s one of the defining features of the Cigweld COMET 3 blowpipe. -
Spindle and seat: non-rotating valve spindle
The valve spindle is designed so that the sealing surface doesn’t twist and grind every time you adjust the knob. This reduces seat wear over time and helps the Cigweld COMET 3 blowpipe stay gas-tight with consistent performance. -
Hose connections: dedicated left-hand / right-hand threads
Oxygen and fuel hoses connect to clearly differentiated threaded ports, making it far harder to accidentally swap gas lines. It’s a built-in safety feature and a key reason many shops standardise on the Cigweld COMET 3 blowpipe. -
Sealing between handle and attachment: O-ring sealed interface
Mixers, heating barrels and cutting attachments seal with an O-ring and are secured with hand-tightened threads and locking teeth. No spanners are needed for normal assembly, and the O-ring system on the Cigweld COMET 3 blowpipe helps prevent leaks.
On paper, these specs describe a high-flow, heavy-duty handpiece. In practice, they translate into a handle that feels equally at home doing precise oxy-acetylene welding (technical overview) or running a large heating tip on LPG with the same Cigweld COMET 3 blowpipe body.
How the two-stage valve in the Cigweld COMET 3 blowpipe works
One of the most important features of the Cigweld COMET 3 blowpipe is its two-stage "valve-in-valve" design. This is not just marketing language – it directly affects how your flame behaves, especially when you’re trying to move between very small and very large flames with the same handle.
Inside each gas valve is a smaller seat and a larger seat arranged in a two-stage configuration. When you first crack the knob open on the Cigweld COMET 3 blowpipe, only the small seat opens. This restricts flow and gives you exceptionally fine control over gas delivery. For jobs like delicate fusion welding, fine brazing, or soldering small components, that sensitivity is exactly what you need.
As you continue opening the valve further, the smaller seat reaches its full opening and the larger seat begins to lift. At this point, the Cigweld COMET 3 blowpipe can deliver much higher flow rates suitable for heavy heating tips or cutting attachments. Within roughly a single turn or so from crack-open to fully open, you go from fine adjustment to high-flow mode.
The advantage here is obvious when you are using the Cigweld COMET 3 blowpipe across different processes in a single shift. You don’t have to swap to a different handle for heavier work; instead, the same blowpipe body, combined with the correct mixer and front-end attachment, can support both extremes. It makes the Cigweld COMET 3 blowpipe a true all-rounder.
Because of the non-rotating valve spindle, the sealing surfaces inside the Cigweld COMET 3 blowpipe are not being ground away every time you adjust the flame. That helps the two-stage valve maintain its smooth, precise feel over years of use, provided you’re using clean, dry gas and maintaining the equipment according to manufacturer recommendations.
Ergonomics, safety, and compliance with the Cigweld COMET 3 blowpipe
A good oxy-fuel handle does more than move gas. The Cigweld COMET 3 blowpipe has a number of ergonomic and safety features that make it reliable and comfortable in real-world conditions where gloves, heat, noise and time pressure are everyday realities.
The body of the Cigweld COMET 3 blowpipe is contoured to give a positive grip so that it feels secure in the hand even when you’re wearing welding gloves or your hands are slightly oily. This contouring, combined with its balanced weight, helps reduce fatigue during long heating or cutting jobs.
Colour-coded knobs make it easy to identify and control oxygen versus fuel on the Cigweld COMET 3 blowpipe. When you’re working quickly around other hot work, that visual distinction reinforces good habits for lighting and shutting down the torch, especially when multiple people may be using the same setup.
On the safety side, the left-hand and right-hand threaded hose connections help prevent accidental cross-connection of oxygen and fuel. This is a basic but crucial safety feature that is standard on quality oxy-fuel gear like the Cigweld COMET 3 blowpipe. Combined with correctly specified flashback arrestors at the regulator and/or handpiece, you get a safer system for both the operator and the workplace.
In many markets, COMET equipment is designed to align with recognised guidelines for the safe use of portable and mobile oxy-fuel systems. For detailed official guidance on gas welding, cutting and similar processes, always refer to current safety leaflets and local regulations. This kind of information underlines why equipment such as the Cigweld COMET 3 blowpipe is engineered with robust safety principles in mind – from non-return valves and flashback compatibility to correct thread forms and leak-tight connections.
The O-ring sealing system between the handle and the mixer or attachment also contributes to safety and reliability. By allowing secure, hand-tight assembly, the Cigweld COMET 3 blowpipe discourages over-tightening with tools, which can damage threads, compromise sealing surfaces and introduce leaks.
Compatible mixers, tips and attachments for the Cigweld COMET 3 blowpipe
Another big advantage of the Cigweld COMET 3 blowpipe is the ecosystem around it. The handpiece is part of the broader COMET system, so you can configure it for different jobs simply by changing mixers, welding tips, heating tips or cutting attachments.
Here are some of the key accessory types commonly used with the Cigweld COMET 3 blowpipe:
Mixers
The mixer is what tailors the Cigweld COMET 3 blowpipe for a particular gas combination and flow range.
- General-purpose oxy/fuel mixers — used for oxy/acetylene or oxy/LPG welding and light to medium heating. These mixers are sized so that a single Cigweld COMET 3 blowpipe can support multiple tip sizes.
- High-flow mixers — for heavier heating and cutting. With the right high-flow mixer, the Cigweld COMET 3 blowpipe can handle large heating barrels or cutting attachments while maintaining stable flame characteristics.
- Injector-type mixers for LPG or natural gas — tailored specifically to LP Gas or Natural Gas, these mixers are designed to give stable performance for super-heating tips and longer pre-heat work. When you outfit your Cigweld COMET 3 blowpipe with an injector mixer, it becomes a serious tool for structural heating and pre-heat.
Welding tips and nozzles
Swaged welding tips in sizes ranging from smaller diameters up to larger sizes for around 12 mm plate can all be used with the appropriate mixer on the Cigweld COMET 3 blowpipe. That means one handle can cover thin sheet metal up to heavier fabrication tasks.
For braze welding and brazing, tips are selected based on joint size and required heat input. With the Cigweld COMET 3 blowpipe, you can move from small copper tube brazing to larger steel assemblies simply by changing tips, while still enjoying the fine low-end control of the two-stage valve.
Heating tips and barrels
- Standard heating tips — often used for tasks like bending, straightening, pre-heating and nut/bolt freeing. The Cigweld COMET 3 blowpipe paired with these tips is a dependable all-round heating tool.
- Super-heating tips and long barrels — designed for heavy structural heating, such as pre-heating large weldments, relieving stress or working on thick plate and sections. Long barrels give more reach and keep the operator’s hand further from the heat source when using the Cigweld COMET 3 blowpipe.
Cutting attachments
With a dedicated cutting attachment fitted, the Cigweld COMET 3 blowpipe becomes the back end of an oxy-fuel cutting torch. Depending on the attachment and nozzle types, it can handle plate cutting, sheet cutting and rivet cutting using oxygen with acetylene or LPG/natural gas.
Cutting attachments use various nozzle series designed for the fuel gas in use and the thickness range of the material. By matching the correct cutting attachment and nozzles to your Cigweld COMET 3 blowpipe, you can build a versatile cutting setup without needing a separate dedicated cutting torch body.
Safety accessories
To complete the system around the Cigweld COMET 3 blowpipe, you’ll usually add:
- Blowpipe-mounted flashback arrestors
- Quick-connect couplings for faster hose changes
- Lighters and gas economisers
Together, these accessories allow you to create a complete, flexible oxy-fuel system built around the Cigweld COMET 3 blowpipe as the main handpiece.
Common applications for the Cigweld COMET 3 blowpipe in the field
So where does the Cigweld COMET 3 blowpipe actually show up in day-to-day work? The short answer: almost anywhere heavy metal work is done. Here are some of the most common applications across workshops and job sites.
General fabrication welding
In fabrication shops, the Cigweld COMET 3 blowpipe is often used for oxy-acetylene welding of mild steel, especially for repair work, small runs, brackets and structural details. With swaged welding tips sized correctly for the material thickness, operators can lay down strong, clean welds from thin sheet up to around 12 mm plate.
Because the two-stage valve in the Cigweld COMET 3 blowpipe gives fine control at low flow, it’s comfortable for operators who regularly switch between tack welds, short weld runs and pre-heat. Instead of swapping torches, they can simply dial in the flame they need.
Brazing and soldering
For copper pipe, brass components and mixed-metal joints, brazing is often preferred over fusion welding. Here, the Cigweld COMET 3 blowpipe paired with the correct tip and mixer gives smooth, controllable heat. Its sensitive low-end adjustment helps avoid overheating small components or burning off flux prematurely.
On mixed fabrication and maintenance jobs, it’s common to use the same Cigweld COMET 3 blowpipe for brazing copper tube one moment and then heating a seized bolt the next. Being able to handle both with one handle saves time and simplifies gear on site.
Heating and straightening
Maintenance crews and fitters frequently use the Cigweld COMET 3 blowpipe for targeted heating jobs: freeing rusted fasteners, straightening bent structural members, shrinking metal, or pre-heating parts prior to welding or cutting. With standard heating tips, the handle provides a controllable flame that can be focused on a precise area.
When equipped with larger or super-heating tips on LPG or natural gas, the Cigweld COMET 3 blowpipe can deliver serious heat over a broader area. This makes it useful for heavy fabrication, such as pre-heating thick sections, heavy machinery parts or structural weld joints.
Oxy-fuel cutting
With a cutting attachment and appropriate nozzles, the Cigweld COMET 3 blowpipe becomes the heart of an oxy-fuel cutting torch. It’s used for:
- Cutting plate and sheet to size
- Bevel cutting for weld preparation
- Removing rivets or old welds
- Cutting scrap and dismantling structures
The high-flow capability of the Cigweld COMET 3 blowpipe is crucial here, as cutting requires sufficient oxygen for both pre-heat and the cutting jet.
Surface treatment and cleaning
For tasks like powder facing or flame cleaning, the Cigweld COMET 3 blowpipe can again be paired with specialised nozzles or tips. Operators use controlled flame to remove paint, scale, rust or contaminants from metal surfaces, often prior to painting, welding or inspection.
In all of these applications, the key value of the Cigweld COMET 3 blowpipe is that a single, durable handle can be configured in multiple ways, supporting many different tasks in the same workshop or field environment.
Installing and setting up the Cigweld COMET 3 blowpipe
Correct installation and setup are critical to getting the most from your Cigweld COMET 3 blowpipe. While you should always follow current manufacturer instructions and site procedures, the basic steps follow a standard oxy-fuel pattern.
1. Inspect the handpiece and attachments
Before assembly, visually inspect the Cigweld COMET 3 blowpipe body, the O-ring on the mixer or attachment, and the threads. Check for:
- Cuts or damage on the O-ring
- Damaged or contaminated threads
- Obvious impact damage on the handpiece body
Replace any worn or damaged parts before you press the Cigweld COMET 3 blowpipe into service. A small crack or damaged seal can lead to leaks or poor performance.
2. Fit the mixer or attachment
Insert the selected mixer, heating barrel or cutting attachment into the front of the Cigweld COMET 3 blowpipe. Screw it in by hand only until snug. The O-ring provides the gas seal, and the locking teeth allow you to set the angular position.
Adjust the angle of the attachment so that the workpiece is comfortable to reach. Once you’re happy, hand-tighten again so the locking teeth bite and prevent rotation. No spanners or extra tools are normally required when assembling the Cigweld COMET 3 blowpipe and its attachments.
3. Connect the hoses
Connect the oxygen hose to the right-hand threaded port and the fuel gas hose to the left-hand threaded port on the Cigweld COMET 3 blowpipe. The different thread directions help prevent cross-connection. Ensure the hoses are in good condition and rated for the gas and pressure in use.
At this stage, fit flashback arrestors at the regulator and/or blowpipe end if they are not already part of your setup. Selecting arrestors that are compatible with your Cigweld COMET 3 blowpipe and gas pressures is a key part of system safety.
4. Set regulator pressures
With the Cigweld COMET 3 blowpipe assembled, set your regulator pressures according to the tip charts for the process you’re about to carry out. Cutting, brazing, welding and heating each have recommended oxygen and fuel pressures depending on tip size, plate thickness and fuel gas type.
Following these guidelines ensures that the Cigweld COMET 3 blowpipe receives the correct gas flows to give a stable flame. Too low and the flame may be unstable or underpowered; too high and you may waste gas, increase noise and potentially affect cut or weld quality.
5. Purge, light and adjust the flame
Purge the hoses individually to remove air, following your site procedure. Then, with the Cigweld COMET 3 blowpipe in hand:
- Open the fuel valve slightly and ignite at the tip
- Slowly introduce oxygen until you achieve the desired neutral, carburising or oxidising flame as required
- Fine-tune the flame using the sensitive low-end control of the two-stage valves on the Cigweld COMET 3 blowpipe
When shutting down, close oxygen first and then fuel, again following standard oxy-fuel practice.
Choosing between COMET 3 variants and alternatives
The Cigweld COMET 3 blowpipe with a 5/8"-18 UNF connection is one of the most commonly specified versions, but it’s not the only configuration in the COMET family. Depending on your site standards and hose fittings, you may encounter alternative thread sizes or dedicated cutting torches that share similar design principles.
For example, some COMET 3 handpieces use 9/16"-18 UNF threads to match different regional hose standards. These alternative models function similarly to the 5/8" version but are tailored to existing infrastructure. If your workshop is already standardised on 5/8" fittings for regulators, flashback arrestors and hoses, sticking with the 5/8" Cigweld COMET 3 blowpipe keeps things simple.
You may also see dedicated COMET cutting torches that extend the body length significantly. These are designed for frequent or heavy cutting work, whereas the Cigweld COMET 3 blowpipe plus cutting attachment is more of a flexible all-rounder. In many shops, the handpiece gets the nod for its versatility, while a long cutting torch is kept for frequent plate-cutting operations.
When comparing alternatives, consider:
- Gas compatibility — will the handle and its mixers support the fuel gases your site uses?
- Thread standards — do the hose and regulator connections match your installed gear?
- Flow capacity — can the handle support the heating or cutting tips you plan to run?
- Ergonomics and safety — do the controls feel intuitive and robust?
In most general fabrication and maintenance environments, the Cigweld COMET 3 blowpipe ticks these boxes while giving the flexibility to reconfigure the same handpiece for many different jobs.
Related welding & oxy-fuel product collections
If you’re considering the Cigweld COMET 3 blowpipe for your workshop or site kit, it also helps to explore related gear that completes your welding and cutting setup. These curated collections bring together compatible products so you can build a safe, efficient oxy-fuel system around your chosen handpiece.
- Cigweld Collection →
Explore a wide range of Cigweld equipment – from the Cigweld COMET 3 blowpipe (304001) itself to regulators, electrodes and other welding accessories that keep your process consistent and reliable. - Welding & Soldering Equipment →
Browse complementary welding and soldering tools, equipment and accessories to round out your setup, whether you’re doing light fabrication, repairs, or more intensive shop work alongside your Cigweld COMET 3 blowpipe. - BOC Collection →
Discover BOC-branded welding and safety products that pair well with oxy-fuel systems. From PPE to supporting equipment, this collection helps ensure your Cigweld COMET 3 blowpipe operates in a safer, more controlled environment.
Conclusion: is the Cigweld COMET 3 blowpipe right for your workshop?
Choosing an oxy-fuel handpiece isn’t just about the spec sheet. It’s about whether the handle can keep up with the variety of work you do day after day. The Cigweld COMET 3 blowpipe brings together a robust body, a clever two-stage valve, multi-fuel compatibility and a mature ecosystem of mixers, tips and attachments.
If you need a single handle that can move from fine oxy-acetylene welding, to copper brazing, to heavy heating, to plate cutting with the right attachments, the Cigweld COMET 3 blowpipe is built for that role. Its ergonomic grip, clear LH/RH hose connections, O-ring sealed attachments and compatibility with recognised safety standards make it a solid choice for both workshop and field use.
For supervisors and buyers, the value of a standardised system is also significant. Training, maintenance and spare parts management all become easier when your crew uses one primary handpiece model like the Cigweld COMET 3 blowpipe across multiple tasks.
If you’re reviewing your current oxy-fuel setup and wondering whether it’s time to upgrade or standardise, take a closer look at the Cigweld COMET 3 blowpipe on the detailed product page from your preferred supplier. Exploring the specs, recommended accessories and available kits will help you decide if this proven workhorse is the right fit for your shop, your team and the kind of work you do every day.