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The Groco macerator referenced is a submersible pump with the pickup at the bottom of the tank. The outlet from this pump goes to the through hull. Even if all of the fittings are on the top of the tank, the pickup for the pump needs to have a tube to the bottom in order to empty the tank.

I have been "blessed" with a malfunctioning Groco MPS 600 in the tank macerator. Been into the tank 2 times now and had the luxury of a dockside pump out each time to clear the tank 1st. I had thought the last time fixed the pump, but alas it it time for a replacement. After this weekend I...