Tired of battling Jack Frost? Revamping your 1967, 1968, 1969, 1970, 1971, or 1972 Chevy or GMC truck's heating and defrost system is your best line of defense. This air distribution case is like your heater and defroster system's drill Sergeant ordering the air flow to its enemy. The distribution duct diffuses air flow from the heater box to your underdash ducts. Using quality replacement heater and defroster components from Eckler's Classic Chevy Trucks will lead you to victory over the menacing Jack Frost.