6mm (1/4 in.) Pneumatic Push in Straight Union Fitting, Quick toConnectDescription:Straight Fitting 6mm (1/4 in.) OD x 4mm ID PortsIt is designed for using to connect with polyethylene, nylon and PU tubing.Simple push in design for connecting to the tube and provide secure connection, requires no extra sealing.Round release ring on two ends facilitates pneumatic installations in confined spacesMaterial: PlasticDimension: (Approx) 1.37″ (L) x 0.52″ (W)Main Color: Black, BlueUNKRP013444