Aftermarket Sherwood M71 Cummins 3912019 Seawater Pump Aftermarket Sherwood M71 Cummins 3912019 Seawater Pump Replaces Cummins / Sherwood part number: 3912019, 3907458, M71 Used on Cummins engines: 4BT & 6BT Water ports: Inlet & Outlet 1-1/4" Seawater pump by Sweedish company Albinus. MSRP: Was: Now: $1,265.00 Add to Cart