SMC KQ2U01-99 Plug-In Y, 1/8 In, Tube, Polybutylene. More details: Plug-In Y, Basic Material Plastic/Metal Combination, Body Material Brass and Polybutylene, Connection Type Tube, Tube Size 1/8 In., Stem OD 1/8 In., Max. Pressure 145 psi, Color White/Gray, Temp. Range 23 Degrees to 140 Degrees F