For 1978 GMC P35 Radiator Cap 93139GHTS Standard -- Relief pressure 16 lb

For 1978 GMC P35 Radiator Cap 59423BTCD Standard -- Relief pressure 16 lb

1.3 Bar Thermostatic Radiator Cap 13 PSI Pressure Rating with Temperature Gauge

1.1 Bar Thermostatic Radiator Cap 13 PSI Pressure Rating with Temperature Gauge

1.1 Bar Thermostatic Radiator Cap 13 PSI with Pressure Rating Temperature Gauge

For 1978 GMC C15 Radiator Cap 22824MF Radiator Cap -- Pressure Rating 16 psi

For 1978 GMC K25 Radiator Cap 32835FJ Radiator Cap -- Pressure Rating 16 psi

For 1978 GMC K15 Radiator Cap 32273XJ Radiator Cap -- Pressure Rating 16 psi