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 forcars 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 on the outside and features a female -16ORB thread on the inside for thosewanting custom braided lines. A -3ORB port is included in the housing that can be used as a bleed port for the cooling system. This housing accepts a standard Chevy/Ford thermostat (sold separately). Machined from billet aluminiumand available in polished or black anodised finishes. Overall Length is 3.93" (100mm) and overall diameter is 3.14" (80mm).