Impeller Service Kit for MerCruiser MC-1 & R/MR/Alpha One water pumps.

OEM: Mercury Replaces: Mercury 89984Q5 | 89984T6

For 1978-90 MC-1 & R/MR/Alpha One water pumps.

also crosses with: Sierra: 18-3217 GLM: 12290 Mallory: 9-48304