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Eberspacher water pump complete with housing and replacement O-rings x 2 Genuine Eberspacher product Eberspacher D5W Hydronic, Eberspacher D4W Hydronic, Eberspacher B4W & B5W Hydronic Heaters Applicable heaters model list in description below. Pipe outlet outside diameter 18mm Technical support and additional products available from ButlerTechnik Suitable for the following Eberspacher Hydronic water heatersEberspacher Hydronic D5W SCEberspacher Hydronic D4W SC201824050000 B4 SC 12v Hydronic201821050000 B4W SC Hydronic201820050000 B5WSC Hydronic12v201823050000 B5WSC Hydronic 12v252219050000 D5 SC Hydronic252257050000 D4W SC Hydronic252221050000 D4W SC 12v Hydronic252229050000201861050000 B4WSC 12v Hydronic252385050000 D4WSC 12v201863050000 B5WSC 12v 252390050000 D5WSC 12v Please note - Pipe outlet OD 18mm (if you require outlet OD 20mm please see alternative 251920250000)