Reproduction pressure relief valve for any 1968 - 1970 thermactor smog pump. 1968
289-2V, 302-2V, and 302-4V all with manual transmissions, and 1968 390-4V, 427-4V on all domestic US Cougars.
Additionally all 1968 - 1970 428 Cobra Jets, and 1969 - 1970 Boss 302 Eliminators. Identified by the use of 3 attaching bolts for the drive pulley, a white colored cooling fan, and a round pressure relief valve on the side of the pump. Later pumps do not have this pressure relief valve.