WESCO-5 - CGA-320 CO2 Regulator Washer - Black Fiber Flat Seal

Stop Leaks and Save Gas

Every welder knows the frustration of hearing that faint hiss coming from the back of the machine—it's the sound of money leaking into the air. The CGA-320 Black Fiber Washer is your first line of defense against CO2 leaks in your MIG welding setup. If you are running straight CO2 for shielding, your regulator connects to the cylinder using a flat face fitting that absolutely requires a washer to seal. Metal-to-metal contact alone won't hold the pressure. This black fiber washer is designed specifically to sit inside the nut of your regulator and crush down slightly when tightened, creating a perfect, airtight seal every time you swap out a tank.

Why choose fiber? Fiber washers are tough and forgiving. They allow you to crank down on the nut to get a secure fit without cracking the seal, which can happen with brittle plastic alternatives. This washer measures roughly 3/4 inch wide and 1/8 inch thick, giving you plenty of material to work with. It is rated for the full pressure of a standard CO2 cylinder (up to 3000 PSI), so you can trust it to hold up under shop conditions. Whether you are fabricating in a garage or running a production line, a leak at the tank doesn't just waste gas; it can cause your regulator to freeze up due to the rapid expansion of escaping CO2, potentially damaging your expensive equipment.

These washers are small, inexpensive, and absolutely vital. Experienced welders keep a handful of these in their toolbox or taped to the side of the welder. Old washers get compressed, dried out, and cracked over time, leading to inconsistent gas flow and porosity in your welds. Don't let a ten-cent part ruin a day's work. Swap in a fresh Western Enterprises CGA-320 washer whenever you notice wear or deformation on your old one to ensure your shielding gas stays where it belongs—covering your weld pool.