Designed for K20a1,k20a2, & k20a3 heads. The CNC billet 6061 aluminum ASP water neck is used to lower the radiator hose to intake clearance. Large nipple is applied to thermostat housing. Opposite threaded opening is for the use of a gauge cluster water temp sensor.
Includes: 6061 aluminum ASP water neck, nipple, 1 nipple o-ring and 2 socket cap crews.
Restrictions: Requires the use of the stock water neck rubber gasket.