SMC KQ2C07-00 fitting, tube cap, KQ2 FITTING sold in packages of 10; price is per piece
Series KQ2 one-touch fittings accept nylon, soft nylon and polyurethane tubes, and have a high retaining force. They can be used for a wide range of pressure from a low vacuum up to a pressure of 145 psi 1.0 MPa. The use of a special profile ensures resistance when the tube is being inserted and its release button allows for a low disconnecting force. Series KQ2 one-touch fittings are effective when piping in a confined space.
Allied Electronics:
FITTING, TUBE CAP, 1/4INCH ONE-TOUCH