Used transmission line adapter and check valve for all FMX transmissions. This fitting goes into the rear part of the transmission case and connects the rear most cooling line to the case. Has internal ball check valve to prevent fluid from back flowing. All FMX transmissions 1969-73 Mercury Cougar or Ford Mustang. The male threads going into the transmission case are 1/2-20 pipe threads.
Replaces Ford part number C3AZ-7D174-A.