SMC KQ2U07-00 Union Y, 1/4" Tube Sz, Tube, Brass and PBT. More details: Union Y, Basic Material Plastic/Metal Combination, Body Material Brass and Polybutylene, Connection Type Tube, Tube Size 1/4 In., Max. Pressure 145 psi, Color White/Gray, Temp. Range 23 Degrees to 140 Degrees F