Offered is an NORS Ranco heater control valve from Robertshaw, # H-113, listed for these GM, mostly V8, models with air conditioning: '71-'81 Buick and Pontiac, '71-'85 Cadillac, '74-'81 Chevy, and '75-'80 Olds. Please contact me with a specific model if unsure of an application. Item has 5/8" hose connections and is very nice, comes as shown.