For 1978 GMC K15 Radiator Cap 85962HJZB Safety Lever -- Relief pressure 16 lb

For 1978 GMC K15 Radiator Cap 15511JNHX Standard -- Relief pressure 16 lb

For 1978 GMC K15 Radiator Cap 55582QNGB Safety Lever -- Relief pressure 16 lb

For 1978 GMC C15 Radiator Cap 57133CV 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 C25 Radiator Cap 71932CJJP Standard -- Relief pressure 16 lb

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