Compatibility: Fits OE reference numbers 06H121601M, 5Q0965561B, 5N0965561, 06H121601N, 06H121601P, 059121012A, and 06D121601. Function: Supports auxiliary water circulation and steady coolant flow for the engine cooling system. Design: Engineered as an electronic cooling auxiliary water pump replacement matching the listed OE part numbers. Application: Intended for installation in compatible engine bay cooling systems that use an auxiliary water pump. Quantity: Each unit contains one auxiliary water pump.