PneumaticPlus BUC Series Push To Connect Straight Union Ball Valve (1/4" OD X 1/4" OD Tube) Composite Fitting Push to Connect Tube to Tube Applicable for water (Max Pressure: 50 PSI) and air (Max. Pressure: 284 PSI) When using with water, the pressure must not exceed 50 PSI. Available for water as well as air with PPS resin body. The sectional dimension of the compact body optimizes as much flow as the tube capacity in proportion. Resin body (PBT)