For 1978 GMC C15 Radiator Cap 57133CV Safety Lever -- Relief pressure 16 lb

For 1978 GMC C15 Radiator Cap 36941MXKF Safety Lever -- Relief pressure 16 lb

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

For 1978 GMC C15 Radiator Cap 41375SSGB Safety Lever -- Relief pressure 16 lb

For 1978 GMC G15 Radiator Cap 92623CPNC Standard -- Relief pressure 16 lb

For 1978 GMC C35 Radiator Cap 13418MGRY Standard -- Relief pressure 16 lb

For 1978 GMC K15 Radiator Cap 13977RNBR Standard -- Relief pressure 16 lb

For 1978 GMC C25 Radiator Cap 71932CJJP Standard -- Relief pressure 16 lb