Overview

The Jabsco 18594-1000 is a replacement macerator housing for Jabsco 18590 and 18690 series macerator pumps. It is used on 18590-2092, 18590-2094, and 22130-2721 pump assemblies, so it fits both DC and AC versions in this pump family.

This housing sits in the macerator section of the pump assembly used with a 1-1/2 in inlet side and a 1 in discharge layout. It is the service part to replace when the original housing is damaged, worn at the sealing face, or no longer worth reusing during a rebuild.

For boats that already have one of these Jabsco macerators installed, replacing the housing keeps the existing pump layout in place and avoids changing the rest of the plumbing or wiring. That matters on sanitation systems where space is tight and the pump is already mounted where the hose runs and discharge routing make sense for the boat.

Key features

• Replacement macerator housing for Jabsco 18590 and 18690 series pump assemblies
• Listed for Jabsco 18590-2092, 18590-2094, and 22130-2721
• Matches the macerator side of pumps used in holding tank discharge, fish box drain, and livewell evacuation setups
• Useful when the original housing is cracked, worn, or being changed during a broader pump service
• Lets you repair the installed pump assembly without changing the full unit

Compatibility and fit

Check the model number on the pump and the exploded parts breakdown before ordering. This housing is used across the 18590 and 18690 service range, but the safest match is the actual part number on the old housing or the pump parts list for your specific assembly.

This is a service part for an existing Jabsco macerator installation, not a complete pump. It makes sense when the motor, chopper section, and the rest of the pump are still serviceable and the housing is the part that needs attention.

Installation and service

Replacing the housing means opening the macerator end of the pump, so it is worth checking the wear plates, gaskets, impeller, and seal while the unit is apart. That helps avoid putting the pump back into service with another worn part still inside the same assembly.

On board, this is a practical repair for cruising boats, sportfish boats, and workboats that rely on a Jabsco macerator for tank pump-out or waste-water evacuation. It suits owners and technicians who want to keep the original pump footprint and hose routing instead of starting over with a different unit.