Push to Connect Tube Fitting - Polybutylene Plastic - Cap - 4mm Tube OD

Also known as one touch fittings, these tube fittings are designed to slide into the fitting with an internal grasping ring holding it in place. Intended for low pressure applications and for use with plastic and soft metal tubing. Polybutylene won't absorb moisutre, so these fittings are good for water and high-humidity air applications.