Westerbeke Generator Water Pump Impeller Kit | MMDW 43731 Water Pump Impeller Kit Westerbeke Generator | MMDW 43731 MMDW 43731 Westerbeke Impeller Kit MMDW 43731 Impeller Kit Replaces Westerbeke 32620 Aftermarket replacement for Westerbeke 3.0 WMD, 3.8BCDT, 4.0 BCG, 4.5 BCG, 4.5 BCGB, 4.5 BCGTC, 6.5 BCG, 7.0 BCG, 7.0 BCGA, 7.0 BCGB, 7.2 BCGTC, 9.0 BTG and 9.6 BGCTC model generators