Duotight 8mm x 8mm one-way check valve

Duotight - 8mm x 8mm In-line Check Valve

Duotight - 8mm (5/16") x 8mm (5/16") in-line check valve (gas)

This very handy part can save your CO2 regulator and is a sound investment. This particular type of check valve has a low cracking pressure of only 1psi. This check valve is suitable for clean liquids, such as water, or gases. The spring and internal components are made of stainless steel and high-quality EPDM seals.