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Eberspacher Hydronic Combustion Air Motor (12v only) Suitable for many heaters including the following 201753050000 B5WSC 201765050000 B5WSC 201778050000 B5WSC 201785050000 HYDRONIC B5WSC 201788050000 B5WS 201791050000 B5WSC 201792050000 B5WSC 201818050000 B5WZ 201819050000 B5WS 201820050000 B5WSC 201822050000 B5WS 201823050000 B5WSC 201863050000 B5WSC 251920050000 D5W 252098050000 252216050000 D5WZ 252217050000 D5WS 252219050000 D5WSC 252221050000 D4WSC 252228050000 D5WS 252229050000 D5SC 252257050000 D4WSC 252386050000 D5WS Please note: 12v only