-20 an Adapter Suits All 360 deg/ Swivel Thermostat Hous Black

these an water neck adapters from allow the use of an hose and fittings for radiator hose applications. Specifically designed for use on all 360-degree swivel thermostat housings from Aeroflow performance. Simply remove thebarb fitting and screw in one of these an adapters. -16an adapter is 52mm (2-3/16”) from O-ring toan, -20an adapter is 54mm (2-1/8”) from O-ring to an.