84W85 - ESAB 84W85 Replacement O-Ring for PT-31 Plasma Torch (Pack of 25)

Keep Your Torch Cutting Clean

Every welder knows the frustration of a sputtering plasma torch. Often, the culprit isn't the machine or the tip—it's a dried-out, cracked, or missing O-ring. The 84W85 O-Ring (25/Bag) is your insurance policy against downtime. Designed to fit the popular PT-31 and PT-31XL plasma torches, these O-rings are the exact size (3/8" ID) needed to seal the connection between your torch head and the consumables. When this seal fails, you lose gas pressure, your arc becomes unstable, and your consumables burn up faster than they should.

Why buy a pack of 25? Because O-rings are small, easy to lose, and wear out regularly. If you are in the middle of a long cut or a critical job, the last thing you want is to stop work because a fifty-cent piece of rubber failed. With this bulk pack in your toolbox, you can swap out a worn O-ring in seconds and get right back to cutting. It is a smart addition to any shop's inventory, especially if you are running older L-Tec machines or generic plasma cutters that utilize the PT-31 style torch platform.

Installation is simple. Just remove the old, brittle O-ring—being careful not to scratch the torch body—apply a tiny amount of silicone lubricant if recommended for your specific setup, and roll the new 84W85 into the groove. You will feel the difference immediately: the parts will seat better, the gas flow will be consistent, and your pilot arc will strike more reliably. Don't let a simple air leak compromise your cut quality.

These O-rings are built to handle the heat and stress of the welding environment. However, like all rubber parts, they eventually degrade. Signs that you need to replace your O-ring include difficulty seating the shield cup, hissing sounds coming from the torch head (indicating a leak), or visible cracks in the rubber when you inspect it during consumable changes. Stay ahead of the game and keep your equipment running at peak performance with this essential maintenance pack.