950140 - ESAB 950140 Replacement Back Up Ring for R-76/R-77 Regulators

Keep Your Regulator Running with the ESAB 950140

If you are a professional welder or fabricator, you know that your regulator is the heart of your gas delivery system. Whether you are cutting with oxy-fuel or welding with MIG/TIG, a consistent and safe flow of gas is non-negotiable. The ESAB 950140 Back Up Ring is a small part that makes a huge difference in the performance of your R-76 or R-77 series regulators. Over years of service, the internal seals of a regulator take a beating from the constant pressure cycles of opening and closing cylinder valves.

When you start noticing issues like "creeping" (where the delivery pressure rises slowly when the torch is off) or hear a faint hiss from the regulator body, it’s often a sign that the internal seals are compromised. While the rubber O-ring does the actual sealing, the Back Up Ring (Part #950140) is the muscle behind it. It sits right next to the O-ring and stops it from getting squashed out of shape by the high pressure coming from your tank. Without a healthy back up ring, even a brand-new O-ring will fail prematurely.

Don't risk your safety or the quality of your welds with a faulty regulator. Rebuilding your trusted ESAB R-76 or R-77 is often much cheaper than buying a new unit, and it keeps high-quality vintage brass in service. This genuine ESAB part ensures a perfect fit, meaning you won't have to struggle with installation or worry about leaks a week later. It is designed to handle the rigors of the shop environment and is compatible with the specific internal geometry of these classic regulator models.

Maintenance is part of the trade. When you tear down your regulator for a clean and rebuild, don't skimp on the hard parts. Replace the back up ring along with your O-rings and seats. It’s a cheap insurance policy against leaks, fire hazards, and wasted gas. Keep a few of these in your repair kit so that when a regulator goes down, you can get it back on the bottle and get back to burning metal without missing a beat.