Duotight Push-In Fitting - 9.5 mm (3/8 in.) Check Valve

This Duotight check valve is a great idea for protecting your regulator. It has a low opening pressure of 1 psi, and since it cannot be opened or taken apart, it is recommended for gas applications only. The internal components are made from stainless steel. Compatible with EVABarrier 9.5 mm OD tubing).  Duotight fittings are high-quality push-in fittings that seal tight and offer superior sealing capacity due to the double O-ring sealing design.   High-Performance Double O-Ring Design: The secret to Duotight’s superior sealing performance comes from the fact that they use not one, but two high-quality EPDM O-rings.  The double O-ring means they have literally twice the sealing surface when compared with other push-in fittings.  This makes them more reliable and significantly reduces the chance of leakage.   The double O-ring system also means that tubing can be bent at a much tighter radius without causing leaking issues, which can be an issue with oth