CO2 Gas Washers (19mm x 10mm) – Replacement O Rings for Primary Regulators

If your CO2 bottle is losing pressure or you can hear a slight hiss around the regulator, there’s a good chance the issue isn’t the regulator itself — it’s the washer.

These CO2 gas washers sit between your gas bottle and primary regulator, creating the seal that keeps everything airtight. Over time, they wear down, harden, or simply go missing when changing bottles — which is one of the most common causes of gas leaks.

Keeping a few spares on hand is a simple way to avoid wasted gas, inconsistent pressure, and unnecessary troubleshooting.

Why you might need these

• Gas leaking from the connection point
• Regulator not sealing properly onto the bottle
• Washer lost during a bottle change (very common)
• Old seal becoming brittle or flattened

Product Details

• Outer Diameter: 19mm
• Inner Diameter: 10mm
• Suitable for: CO2 primary gas regulators
• Material: Durable rubber sealing washer

Simple fix, big difference

Something as small as a worn washer can cause ongoing gas loss without it being immediately obvious. Replacing it takes seconds, but can save you from empty bottles, poor dispense performance, and repeat issues.

Tip

Whenever you swap a CO2 bottle, it’s worth checking the washer before reconnecting. If it looks worn or compressed — replace it. It’s far cheaper than losing a full bottle of gas.

FAQ 

Why is my CO2 regulator leaking?
In many cases, it’s due to a worn or missing washer rather than a fault with the regulator itself.

Do CO2 washers need replacing regularly?
They don’t need constant replacement, but they should be checked each time you change a bottle and replaced if worn.

Are these universal?
These washers fit most standard CO2 primary regulators, but always check your measurements (19mm OD, 10mm ID) to be sure.