GRC MGB GT or Roadster Radiator Cap.
There are 4 different pressures for the different radiators. Please choose from drop down the one for your car.
1962-1967 swan neck rear filler neck radiator 7lb
1968-1974 c/b centre fill radiator 10lb
1975-76 r/b with centre fill radiator 13lb
1976-80 expansion tank fitted 15lb