The Aeroflow Performance inline thermostat housing allows you to remote mount a thermostat inline in between the top radiator hose from your cooling system away from the engine. This is useful for cars that have no room to allow the thermostat to be on the engine block. This inline thermostat accepts a 1-1/2" (38mm) radiator hose and takes a standard Chevy thermostat (sold separately) Machined from billet aluminium and available in polished or black anodised finishes. Overall Length is 3.93" (100mm) and overall diameter is 3.14" (80mm).