SMC KQ2T06-04 Reducing Tee, 6 x 4mm, Tube, Polybutylene. More details: Reducing Tee, Basic Material Plastic/Metal Combination, Body Material Brass and Polybutylene, Connection Type Tube, Tube Size 6mm x 4mm, Max. Pressure 145 psi, Color White/Gray, Temp. Range 23 Degrees to 140 Degrees F