3/8" OD nylon straight union tube fitting has offer easy installation of air lines by simply pushing tubing into fitting with no gluing or special tools required. Reusable by simply pushing sleeve in and releasing the tubing. Ideal for splicing or repair, these push to connect tube fittings are designed for use with nylon, polyurethane, or low and high density polyethylene tubing. Great for garage or shop, Milton® push to connect tube fittings allow for maximum air flow and faster connection than standard compression fittings.