1/4" MNPT nylon push to connect fittings offer easy installation of air lines; simply push tubing into fitting. No gluing or special tools required for this 1/4" MNPT x 3/8" OD connector. Reusable by simply pushing sleeve in and releasing the tubing. Milton® push to connect fittings are designed for use with nylon, polyurethane or low and high density polyethylene tubing. Great for the garage or shop, these fittings allow for maximum air flow and faster connection than standard compression fittings. Maximum working pressure of 150 PSI.