Jabsco Top Valve Gasket 29042-0000 for 29090-2 and 29120-2 Manual Toilets, 1998 and Newer

The Jabsco Top Valve Gasket 29042-0000 is a replacement seal for the top valve assembly on Jabsco 29090-2 and 29120-2 series manual marine toilets built 1998 and newer. This gasket seats between the top valve seat and the pump cylinder housing, sealing the discharge path so the manual pump can build and hold pressure during flushing. Over time, repeated pump strokes and exposure to saltwater and waste can compress or degrade the original gasket, leading to a soft pump handle, reduced flush effectiveness, or leakage around the top valve area. Replacing this gasket restores a firm seal without requiring a full service kit or pump cylinder replacement.

Installation involves removing the top valve cover and pump cylinder to access the old gasket, cleaning the mating surfaces, and fitting the new 29042-0000 gasket in its place before reassembly. It is a genuine Jabsco part, so fit and material match the original equipment exactly, and it is manufactured from metal construction consistent with the rest of the top valve assembly. Because it addresses only the top valve gasket, it is a targeted fix for owners who do not need the broader range of seals and o-rings included in a full major service kit.

Specifications

• Brand: Jabsco
• Manufacturer Part Number: 29042-0000
• Product Category: Marine Toilet Parts
• Material: Metal
• Item Dimensions: 6.3 x 3.1 x 0.7 inches
• Weight: 0.1 pounds
• Included Components: Gasket
• UPC: 671880022354

Fitment

• Jabsco 29090-2 and 29120-2 series manual toilets, 1998 and newer

Frequently Asked Questions

What does the Jabsco 29042-0000 gasket fit? This gasket is designed for Jabsco 29090-2 and 29120-2 series manual toilets built 1998 and newer, sealing the top valve assembly of those models.

Is 29042-0000 a genuine Jabsco part? Yes, part number 29042-0000 is a genuine Jabsco top valve gasket, not a generic aftermarket substitute, so it matches the original equipment fit and material exactly.

What is included with this purchase? The package contains one top valve gasket (Jabsco 29042-0000); no other seals, o-rings, or hardware are included.

What material is the 29042-0000 gasket made from? The gasket is made of metal construction, matching the material used in the surrounding top valve assembly on the compatible Jabsco toilets.

What are the dimensions of this gasket? The Jabsco 29042-0000 gasket measures 6.3 x 3.1 x 0.7 inches and weighs 0.1 pounds.

Do I need a full service kit, or will this gasket alone fix a leak? If the leak or pressure loss is isolated to the top valve gasket area, installing 29042-0000 alone can resolve it; a broader major service kit is only needed if other seals in the pump assembly are also worn.

Will this gasket fit older Jabsco toilets made before 1998? No, the 29042-0000 top valve gasket is specified for 29090-2 and 29120-2 series manual toilets from 1998 and newer; earlier models are not covered by this part number.

How do I install the 29042-0000 gasket? Installation requires removing the pump cylinder and top valve cover to access the old gasket, cleaning the sealing surfaces, and fitting the new 29042-0000 gasket before reassembling the pump.

What symptoms indicate the top valve gasket needs replacing? A soft or spongy pump handle, weak flush pressure, or visible leakage around the top valve area on a Jabsco 29090-2 or 29120-2 toilet are common signs the 29042-0000 gasket has worn out.

Can I use this gasket with the 29045-2000 or 29045-3000 service kits? The 29042-0000 gasket is a standalone top valve gasket; it is a different part from the broader 29045-2000 and 29045-3000 major service kits, which include multiple additional seals and components.