1991 GMC P3500 equipped with 7.4L V8 Gas OHV, 6.2L V8 Diesel OHV, 5.7L V8 Gas OHV, 4.3L V6 Gas OHV, 3.9L L4 Diesel OHV Turbo
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AC System Seal Kit Caps and Valve Core Seal Kit w/ R12 or R134a Retrofit System
1991 GMC P3500 equipped with 7.4L V8 Gas OHV, 6.2L V8 Diesel OHV, 5.7L V8 Gas OHV, 4.3L V6 Gas OHV, 3.9L L4 Diesel OHV Turbo
AC System Seal Kit Caps and Valve Core Seal Kit w/ R12 or R134a Retrofit System