Toto FLAPPER SEAL GASKET 9BU014E

The 9BU014E is the tank to bowl gasket for TOTO two-piece toilets. It's the rubber seal that sits between the bottom of the tank and the top of the bowl, so water leaving the tank on a flush goes into the bowl instead of out onto the floor. If you're seeing water on the floor only at the moment of flushing, and the supply line and shutoff are dry, this seal is the usual cause.

Not reliably on a TOTO. TOTO tank outlets and bowl inlet surfaces vary by model, and a generic sponge gasket sized for a common two-piece toilet can sit proud of the seat or fail to bridge the opening, which leaves you chasing the same leak. The 9BU014E is TOTO's own part number for the tank to bowl seal, so matching the number to what your model calls for is the way to get it right the first time.

Start with the gasket. A leak that shows up only during a flush, running down the back of the bowl from the joint, points at the tank to bowl seal, and that is what the 9BU014E replaces. A leak that continues between flushes, or water trickling into the bowl constantly, is a flapper or flush valve seat problem instead, not this part. Diagnose which one you have before ordering, because the two failures look similar on the floor and take different parts.

It's a replacement part, the gasket alone, ordered under TOTO part number 9BU014E. Tank bolts, washers and nuts are separate. If the bolts you're pulling out are corroded or the brass is scored where the washers seat, order those at the same time; reusing pitted bolts on a fresh gasket is how a repair comes back.

For the tank to bowl joint, yes, that's the seal the 9BU014E covers. One caution for a fleet: TOTO uses different tank to bowl gaskets across its two-piece models, so confirm 9BU014E is the number called out for the specific tank models on your properties before you buy a case. If your units are mixed vintages, pull the model number off the inside back wall of a tank on each type first.

No. Replacing the 9BU014E is a tank-off job, not a toilet-off job. Shut the supply, flush and sponge the tank dry, disconnect the supply line, back off the tank bolts from underneath the bowl rim, lift the tank clear and set it on its side, then swap the gasket and reset the tank. The closet flange wax ring stays undisturbed, which is the whole reason this repair is worth doing before considering a replacement toilet.