Check the listing for details. Monotight Push-In Fitting - 6.35 mm (1/4 in.) Check Valve. Condition: New. Listed at 7.50 USD. This Monotight 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 6.35 mm OD Tubing. Monotight brings the same superior quality as Duotight push-in fittings but more appropriately sized for applications including water treatment equipment, water filters, reverse osmosis fittings, and more. In addition, they are suitable for both beverage and gas applications, and are pressure rated to 100 psi. Tubing can be released by simply pushing in the collet and pulling the line out. No need for clamps or cutting lines! Features: Insert tubing and firmly push to connectEasily release tubing by pushing in the colletSuitable for both gas & beverage applicationsMade from food-grade acetal plasticO-rings made from highly chemical resistant EPDMLocking teeth made from stainless steelPressure rated to 150 psiTemperature rated to 212°F (100°C) Please note: exposure to chlorine will degrade the acetal plastic and stainless steel these fittings are made from. Do not use in contact with bleach or other chlorinated cleaning chemicals. Kegland Part number: KL21968