The DIF water neck adapter is designed to allow an addition of a 1/8" port to the water neck on the SR20DET engine without having to cut or modify existing radiator hose(s). Each water neck adapter includes a 1/8" NPT bung, a water neck adapter, and all necessary hardware and sealant for simple installation. Each water neck adapter is CNC machined from billet 6061-T6 aluminum, brushed, and clear anodized.