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Eberspacher water pump complete with housing and replacement O-rings x 2Suitable for the following Eberspacher Hydronic water heaters:Eberspacher Hydronic D4W SC252082050000 D 4W Hydronic201784050000 B4W SC 12v Hydronic201770050000 B4W SC 12v Hydronic251917050000 D4W SC 12v Hydronic251917010000 D4W Hydronic 12vPlease note 12v only