Water Pump Base for MerCruiser MC-1 drive water pumps. (without flush, screw in, gear housing)

OEM: Mercury Replaces: Mercury 57234A1 | 57234T1

For 1977-90 MC-1 drive water pumps. (without flush, screw in, gear housing)

also crosses with: Sierra: 18-3417 GLM: 12310 Mallory: 9-43306