For 1978 GMC C15 Radiator Cap 13464QQNK Standard -- Relief pressure 16 lb

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

For 1978 GMC C15 Radiator Cap 39351BPFF Standard -- Relief pressure 16 lb

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 1998 GMC T7500 Radiator Cap 37692QGKX Radiator Cap -- Pressure Rating 10 psi

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

For 1978 GMC G25 Radiator Cap 26655JT Radiator Cap -- Pressure Rating 16 psi