SMC KQ2U06-08 Reducing Union Y, 6 x 8mm, Tube. More details: Reducing Union Y, Basic Material Plastic/Metal Combination, Body Material Brass and Polybutylene, Connection Type Tube, Tube Size 6mm x 8mm, Max. Pressure 145 psi, Color White/Gray, Temp. Range 23 Degrees to 140 Degrees F