Overview

The Jabsco 29043-0000 is a base valve gasket for Jabsco 29090 and 29120 Series manual marine toilets. It fits in the base valve position between the pump cylinder and the toilet base, where this seal is part of the toilet's flush and pumping assembly.

This is a service part for keeping an existing manual head in working order without replacing the full toilet or pump assembly. On these toilets, the gasket sits on three locating pegs under the pump assembly, so fit is tied to the correct toilet series rather than general appearance.

Key features

• Replacement base valve gasket for Jabsco 29090 and 29120 Series manual marine toilets
• Fits between the pump cylinder and the toilet base in the base valve area
• Seats on three locating pegs, which helps position it correctly during reassembly
• Accessible during service by removing the pump assembly from the base
• Useful for planned toilet maintenance when the rest of the manual head is still in serviceable condition

Compatibility and fit

This gasket is not a universal toilet seal. It is matched to the Jabsco 29090 and 29120 toilet families, so the practical check before ordering is the toilet series or parts layout on your existing unit. That matters on boats where heads may have been updated over time and the bowl or pump assembly may not match the original installation paperwork.

It is a good match for owners servicing a Jabsco manual toilet on cruising boats, fishing boats, and other vessels that still use a manual head for its low power draw and straightforward upkeep.

Installation and service

Replacement is straightforward during pump service. After closing the seacocks and removing the pump assembly screws, the gasket is placed on the locating posts with the raised side facing up before the pump is reinstalled. Tighten the fasteners evenly by hand so the plastic base is not put under unnecessary stress.

Because this part sits low in the toilet base, it is worth checking the surrounding valve area while the pump is off. That gives you a clear view of wear parts in the assembly and helps avoid opening the toilet again for another small seal soon after.