These AN water neck adapters from Aeroflow 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 the barb fitting and screw in one of these AN adapters. -16AN Adapter is 52mm (2-3/16”) from O-ring to AN, -20AN adapter is 54mm (2-1/8”) from O-ring to AN.
Dimensions:
Overall Length - 76mm (3").
Under Head Length to Under Head of the O-ring - 44.50m(1.75").
Under Head Length - 52mm (2.05").
Thread is 1-1/4"-20 into thermostat housing.