Johnson F4B-8 bare shaft bronze impeller pump 3/8 inch BSP(F) 3/8 inch input shaft 700 to 2500 rpm 35 lpm maxJohnson F4B 8 bare shaft bronze impeller pump 3 8 inch BSP(F) 3 8 inch input shaft 700 to 2500 rpm 35 lpm max With excellent self priming capability, these pumps are ideal as cooling water pumps for marine engines, bilge pumps, deck wash pumps, freshwater pumps, fuel transfer pumps and other applications Also ideally suited on shore to empty septic tanks, to flush clean and to fill water tanks Excellent self priming capability Ideal as cooling water