labwork Coolant Bottle Cap Replacement for 1981-1987 Chevy GMC Truck

Fitment:Replacement for GM full size trucks 1981-1987 CK series & 1988-1991 RV pickups full size blazer & suburban.Inlet Diameter5/16 Gates Hose IncludedWhen the engine is turned off, the reservoir will collect all coolant that typically spills from high-performance or high-temperature engines. Then, when the engine cools down, the coolant is sent back to the radiator.Note:If the vehicle has experienced an accident, the mounting hole may only come off by one inch. There is a simple solution. Install the bottle and only install the bolts on the aligned holes. Then use a "center punch" to mark one or more holes to be drilled. Place the center punch into the hole on the metal U-clamp, then tap the punch and mark the position to be drilled. After marking the position, remove the bottle. Then drill with a 1/4 inch drill bit. The bottles will now be arranged correctly.