The replacement impeller for the Jabsco Ballast Puppy Pump (model 18220-xxxx), found in most MasterCraft models 2002 and newer, is the Green Jabsco Ballast Puppy Premium Impeller.
These impellers should be replaced periodically based on how frequently you use the ballast system. We recommend replacing this impeller every 1-2 years to make sure you're always getting the full capacity from your pumps. If you're experiencing passive filling/draining, or have noticed slower fill/drain times than normal, then you know your impellers are worn and need to be replaced.
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