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RX WELD Oxygen and Acetylene Regulators Review
Choosing a replacement regulator set is mostly a compatibility decision, not a price decision. The RX WELD Oxy Acetylene Regulator Set pairs a CGA-540 oxygen regulator with a CGA-200 acetylene regulator and uses 9/16"-18 B-size hose outlets. That combination suits a narrow group of small oxy-acetylene systems, but it is the wrong choice for larger CGA-510 acetylene cylinders, A-size hoses, propane tanks, or disposable fuel cylinders. This review explains the exact fit requirements, the useful features, the missing components, and the safety checks you should make before ordering.
Quick Verdict
Rating: 8/10 for a correctly matched small MC-cylinder setup
Best For: Buyers replacing both regulators on a V-style oxy-acetylene kit that uses CGA-540 oxygen, CGA-200 acetylene, and B-size hose fittings
Bottom Line: The set combines two single-stage brass-body regulators with clearly listed connections and pressure-gauge ranges. Its main tradeoff is limited compatibility, especially on the acetylene side, so you must inspect every tank and hose connection before you buy.
Before You Buy: This ASIN is the B-size, PC-handle version with a CGA-200 acetylene inlet for a small MC cylinder. It does not fit a larger CGA-510 acetylene cylinder, propane equipment, disposable MAPP or propane canisters, or a hose that requires a 3/8"-24 A-size outlet.
Key Specifications
| Specification | Verified Detail |
|---|---|
| Product | RX WELD Oxy Acetylene Regulator Set, CGA-540 and CGA-200, B Size |
| Brand | RX WELD |
| Manufacturer | RX WELDER |
| Model / Part Number | RX45OA-PC |
| ASIN | B0CKQYTJK1 |
| Regulator Design | Single-stage pair with PC-handle style adjustment |
| Oxygen Inlet | CGA-540 |
| Acetylene Inlet | CGA-200 for a small MC acetylene cylinder |
| Hose Outlet | 9/16"-18 for 1/4-inch B-size twin welding hose fittings |
| Oxygen Gauge Ranges | 0 to 4,000 PSI inlet gauge; 0 to 100 PSI delivery gauge |
| Acetylene Gauge Ranges | 0 to 400 PSI inlet gauge; 0 to 30 PSI delivery gauge |
| Body Material | Brass, according to the listing |
| Item Weight | 3.25 pounds |
| Package Dimensions | 12.24 × 6.22 × 4.8 inches |
| Included | 1 oxygen regulator, 1 acetylene regulator, PC-handle style adjustment, and an outlet hose connector nut |
| Not Listed as Included | Cylinders, twin hose, torch, tips, check valves, or flashback arrestors |
| Best Use | A correctly matched V-style oxy-acetylene welding or cutting kit using a small MC acetylene cylinder |
What Is the RX WELD Regulator Set?
The RX WELD RX45OA-PC is a two-regulator package for controlling oxygen and acetylene cylinder pressure before the gases enter a compatible twin hose and torch. The oxygen regulator attaches through a CGA-540 inlet. The fuel-gas regulator uses a CGA-200 inlet intended for a small MC acetylene cylinder.
Both outlets are listed as 9/16"-18 B-size connections for 1/4-inch twin welding hose fittings. The product page also describes the pair as single-stage regulators with brass bodies and PC-handle style adjustment. This set supplies the pressure-control components only. You still need compatible cylinders, hose, torch, tips, and any required backflow or flashback protection.
Who Should Buy It?
Best For
- You have a CGA-540 oxygen cylinder and a small MC acetylene cylinder with a CGA-200 valve.
- Your twin welding hose uses 9/16"-18 B-size fittings.
- You need a matched regulator pair for a compatible V-style welding or cutting torch kit.
Skip If
- Your acetylene cylinder uses CGA-510, CGA-520, or another valve connection.
- Your hose uses a 3/8"-24 A-size fitting instead of a B-size fitting.
- You need propane compatibility, disposable-cylinder compatibility, an industrial service guarantee, or a clearly stated warranty term.
Feature-by-Feature Review
CGA-540 Oxygen Connection
The oxygen regulator uses the CGA-540 tank connection listed for this model. That is the first connection you should inspect on your oxygen cylinder. A regulator that looks similar can still use a different inlet, so do not rely on color, gauge shape, or brand alone.
CGA-200 Acetylene Connection
The acetylene regulator is the more restrictive half of the set. It is made for a small MC cylinder with a CGA-200 valve. It is not the RX WELD version for larger acetylene cylinders, and the manufacturer specifically warns that it will not fit propane tanks or disposable MAPP or propane canisters.
B-Size 9/16"-18 Hose Outlets
Each outlet is listed as 9/16"-18 for a 1/4-inch B-size twin welding hose fitting. This helps the set fit many common torch-kit hoses, but it excludes A-size 3/8"-24 hoses. Check the stamped or measured thread specification on your hose nuts rather than assuming every 1/4-inch hose uses the same connection.
Gauge Ranges and Pressure Control
The oxygen side has a 0 to 4,000 PSI cylinder-pressure gauge and a 0 to 100 PSI delivery gauge. The acetylene side has a 0 to 400 PSI cylinder-pressure gauge and a 0 to 30 PSI delivery gauge. Those are gauge ranges, not safe operating targets. Your torch tip chart, equipment manual, gas supplier instructions, and applicable safety rules determine the correct working pressure.
Single-Stage Brass-Body Design
The listing describes both regulator bodies as brass and the design as single stage. A single-stage regulator reduces cylinder pressure in one step, which is common on portable and general-purpose torch kits. The PC-handle style gives you a broad adjustment surface, but the listing does not state an accuracy tolerance, flow-capacity rating, certification, or duty-cycle classification.
Pro Tip: Photograph the valve marking on both cylinders and the thread marking on both hose nuts before shopping. Compare those markings with CGA-540, CGA-200, and 9/16"-18 B-size specifications instead of judging fit from product photos.
How It Performs in Real Use
For Small Welding Repair Work
For a compatible small-cylinder torch setup, the pair gives you separate cylinder-pressure and delivery-pressure readings for both gases. That makes it suitable as a replacement set when your existing torch, hose, tips, and safety devices are still serviceable and use the listed connections. The regulators do not determine the correct flame setting by themselves, so you still need the torch and tip instructions.
For Light Cutting Tasks
The oxygen delivery gauge reaches 100 PSI, while the acetylene delivery gauge reaches 30 PSI. Those display ranges may cover many light cutting-kit requirements, but actual cutting capacity depends on the torch body, cutting attachment, tip size, hose condition, cylinder capacity, and manufacturer pressure chart. Do not treat the gauge maximum as a recommended setting.
For Portable MC-Cylinder Setups
The CGA-200 acetylene inlet is useful when you intentionally use a small MC cylinder for portability. The same feature becomes a limitation if you later move to a larger acetylene cylinder. You would need the regulator version that matches the new cylinder valve rather than forcing the connection or using an unapproved workaround.
As a Replacement Regulator Pair
This set makes the most sense when both existing regulators need replacement and the rest of your system already matches. If only one regulator is damaged, a verified single replacement may cost less and reduce unnecessary changes. Any regulator with a damaged gauge, leaking body, stripped connection, or unstable pressure should be removed from service and evaluated by a qualified supplier or repair facility.
Setup and Compatibility Tips
- Identify every connection first. Confirm CGA-540 on the oxygen cylinder, CGA-200 on the MC acetylene cylinder, and 9/16"-18 B-size hose fittings.
- Inspect before assembly. Do not use a regulator, hose, valve, or gauge that is damaged, contaminated, cracked, or leaking.
- Keep oxygen equipment oil-free. Never put oil, grease, pipe compound, or oily hands and gloves on oxygen valves, fittings, regulators, or hoses.
- Secure cylinders upright. Follow the cylinder supplier and equipment manual for transport, placement, valve opening, and shutdown.
- Open valves slowly. Stand to the side of regulator gauges and follow the torch-kit procedure rather than facing the gauge lenses.
- Leak-test correctly. Use a solution and procedure approved for oxygen-fuel equipment. Never look for a leak with a flame.
- Use the required safety devices. Confirm whether your setup requires check valves, flashback arrestors, or both. The product package list does not identify either item as included.
- Follow the tip chart. Set delivery pressures from the torch and tip manufacturer instructions, not from the maximum numbers printed on the gauges.
Compatibility and Safety
Oxy-acetylene equipment can cause fire, explosion, burns, and high-pressure injuries when parts are mismatched or contaminated. OSHA states that acetylene must not be used above 15 psig, even though this regulator has a 0 to 30 PSI delivery gauge. OSHA also requires oxygen equipment to remain free of oil and grease and says pressure regulators and gauges must be in proper working order.
Review the current OSHA oxygen-fuel gas welding and cutting standard and the OSHA gas welding and cutting requirements before use. Those standards do not replace the RX WELD instructions, your torch manual, cylinder-supplier guidance, local fire code, or hands-on training from a qualified welding professional.
Safety Warning: Never force a regulator onto a cylinder, modify a connection, exceed the equipment maker’s pressure instructions, or use a regulator that creeps, leaks, has a damaged gauge, or has been exposed to oil or grease on the oxygen side.
Pros and Cons
Pros
- Includes both oxygen and acetylene regulators in one package.
- Clearly specified CGA-540 and CGA-200 cylinder connections.
- Uses common 9/16"-18 B-size hose outlets.
- Separate cylinder-pressure and delivery-pressure gauges for each gas.
- Brass-body, single-stage design with PC-handle style adjustment.
Cons
- The CGA-200 acetylene inlet fits only a small MC cylinder, not a larger CGA-510 setup.
- The listing does not provide a clear fixed warranty period, regulator accuracy tolerance, certification, or flow-capacity rating.
- Hose, torch, cylinders, tips, check valves, and flashback arrestors are not listed as included.
Is It Worth the Price?
This RX WELD pair can offer strong value when it exactly matches your existing cylinders and B-size hose. You get both gas regulators together, and the product page clearly lists the main connections, gauge ranges, material, weight, and included connector nuts. That makes it easier to screen for fit than a listing with vague compatibility language.
The value drops quickly when any connection is wrong. A lower purchase price cannot offset the cost or hazard of an incompatible regulator, and this set is not a complete torch system. It is worth considering for a small MC-cylinder setup, but it is not the best fit when you need CGA-510 acetylene compatibility, A-size hose outlets, verified industrial certifications, or a clearly stated warranty period.
How It Compares to Alternatives
If your larger acetylene cylinder uses CGA-510, compare the RX WELD CGA-540/CGA-510 B-size regulator set instead. If your small torch hose uses a 3/8"-24 A-size outlet, the RX WELD CGA-540/CGA-200 A-size version is the closer match. The ARCCAPTAIN small CGA-540/CGA-200 B-size set is another same-connection alternative worth comparing for included parts, documented support, and warranty terms.
The RX45OA-PC reviewed here makes the most sense when you specifically need the combination of CGA-540 oxygen, CGA-200 acetylene, PC-handle style adjustment, and 9/16"-18 B-size outlets. Connection type should decide the comparison before brand or price.
Frequently Asked Questions
What tanks does this RX WELD regulator set fit?
The oxygen regulator fits a cylinder with a CGA-540 valve. The acetylene regulator fits a small MC acetylene cylinder with a CGA-200 valve. Confirm the actual valve markings on your cylinders before ordering.
Will it fit a large acetylene cylinder?
No, not when the larger cylinder uses CGA-510 or another connection. This model has a CGA-200 acetylene inlet for a small MC cylinder. Choose a regulator made for the exact valve on your larger cylinder.
Can you use this regulator set with propane?
No. The product listing says the acetylene regulator does not fit propane tanks or disposable MAPP or propane canisters. Use a regulator and torch system specifically approved for your fuel gas.
What hose connection does it use?
The outlets are listed as 9/16"-18 for 1/4-inch B-size twin welding hose fittings. It is not the 3/8"-24 A-size version. Verify both hose nuts because oxygen and fuel-gas fittings are not interchangeable.
What comes in the package?
The listing names one oxygen regulator, one acetylene regulator, PC-handle style adjustment and an outlet hose connector nut. It does not list cylinders, twin hose, a torch, tips, check valves, or flashback arrestors as included.
Does RX WELD state a warranty period?
The current Amazon page provides a warranty-information link but does not show a fixed warranty duration in the visible technical details. Check the current listing and contact the seller before purchase when warranty coverage is a deciding factor.
What should you do if a regulator leaks or shows pressure creep?
Close the cylinder valves, follow the system shutdown procedure, and remove the equipment from service. Do not attempt an unapproved repair or keep using a regulator with a damaged gauge, stripped fitting, leak, contamination, or unstable delivery pressure. Contact a qualified welding-gas supplier or authorized repair facility.
Should you buy this RX WELD regulator set?
Buy it when your oxygen cylinder is CGA-540, your small MC acetylene cylinder is CGA-200, and your hose uses 9/16"-18 B-size fittings. Skip it when any connection differs or when you need documented specifications beyond the information on the product page.
The Bottom Line
The RX WELD RX45OA-PC is recommended with caveats for buyers who have a small MC acetylene cylinder, a CGA-540 oxygen cylinder, and B-size twin-hose fittings. Its strength is a clearly specified two-regulator package, while its main weakness is narrow compatibility and limited documentation beyond the listing. Skip it for CGA-510 acetylene cylinders, A-size hoses, propane systems, or any setup you cannot positively identify.
