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KRC 15375000 (Black Anodized), one inch thermostat housing spacer is machined to accept a thermostat above the two 3/8" female pipe fittings. Raising the thermostat above the fittings will allow the engine to reach operating temperatures faster. Hoses & Fittings (Sold Separately) run from the spacer to two points on the back of the intake manifold to eliminate hot spots in cylinder heads & engine blocks.