3/8″ MNPT nylon push to connect tube fittings offer easy installation of air lines. Simply push tubing into fitting, no gluing or special tools required. This reusable connector has a 1/4″ OD. Reusable by simply pushing sleeve in and release the tubing. Great for garage or shop, this fitting has a Maximum working pressure of 150 PSI and comes with a Buna-N seal.