This thermostat housing is designed as a direct replacement 022121117C.It is compatible with select models including the A3, TT, Transporter, and R32 equipped with 3.2L and 2.8L VR6 engines manufactured between 2000 and 2009.The housing supports consistent coolant circulation to assist in maintaining engine temperature during normal.Built for under typical driving conditions, it offers a solution for routine maintenance or repair.