1/4" OD straight union fitting tube has nylon push to connect fittings and offers easy installation of air lines. Simply push tubing into fitting - no gluing or special tools required. Reusable by simply pushing sleeve in and release 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 the garage or shop, Milton push to connect tube fittings allow for maximum air flow and faster connection than standard compression fittings.