Mixed Gas Washers (15mm x 10mm) – Replacement O Rings for Mixed Gas Regulators

If you’re running a mixed gas setup and struggling with small leaks at the regulator, the issue is often something simple — the washer.

These mixed gas washers create the seal between your gas bottle and primary regulator. Because mixed gas connections differ from standard CO2, using the wrong size washer (or a worn one) can lead to ongoing leaks, even when everything appears to be fitted correctly.

They’re also easy to lose when swapping bottles, which is why it’s always worth keeping a few spares ready.

Common issues these fix

• Gas leaking at the regulator connection
• Regulator not tightening or sealing properly
• Using a CO2 washer by mistake (very common)
• Washer missing after a bottle change

Product Details

• Outer Diameter: 15mm
• Inner Diameter: 10mm
• Designed for: Mixed gas primary regulators
• Material: Durable rubber sealing washer

Don’t assume it’s the regulator

Mixed gas systems can be frustrating when something isn’t sealing properly. Before replacing expensive parts, it’s always worth checking the washer — it’s often the simplest and cheapest fix.

Important

CO2 and mixed gas washers are not interchangeable. Using the wrong size can prevent a proper seal and cause persistent leaks.

FAQ 

Can I use a CO2 washer on a mixed gas regulator?
No. Mixed gas connections can require a different size washer, so it’s important to match the correct dimensions.

Why is my mixed gas regulator leaking?
A worn, missing, or incorrect washer is one of the most common causes.

How often should I replace the washer?
Check it every time you change the bottle. Replace if it looks compressed, cracked, or doesn’t sit flush.