This pump replaces Yanmar water pump 128397-42500 flange mounted boat engine cooling pump with steel pulley & mounting bracket.
Uses SHCTR Impeller: I-1430 (128990-42200)
Port Size Inside: 1/2" Hose；Outside: Approx 3/4" Hose
Pump Size (LxWxH): 91mm x 114mm x 76mm
Pump Weight (approx): 4.0 lbs (1.82 kgs)

References Yanmar 128397-42500, 128990-42500

Johnson F4B-903 10-13337-01 10-24509-01

Fits engine Models 2GMF, 3GMF, 2YM, 3YM

It features plug & play Replacement; simple & compact Design, strong bronze body, high performance and long life flexible impellers, marine grade shaft, mechanical seal instead of lip seal, heavy duty machined steel pulley and cam-less design.