Parker Hannifin 164PMT-4 Brass Union Tee Prestomatic Fitting, 1/4" Push-to-Connect Tube x 1/4" Push-to-Connect Tube D.O.T. Quick connect push-in fittings for repairing truck and trailer air brake lines For Use in air brake Systems on semi-trucks, trailers, buses, mobile equipment and farm implements Use in secondary air applications such as pneumatic doors for Rail, air seats, shock absorbers and in Cab instruments Stainless steel tube support Assures maximum flow and performance requirements of SAE j2494-3 All brass air brake fitting