American Standard Flush Valve Seal - AMS-7381042

The 7381042 flush valve seal is the replacement seal for American Standard tank models 4035.216 and 4035.516. If your tank carries one of those numbers, this is the part. Tank model numbers are stamped or printed inside the tank near the water line, so pull the lid and check before ordering, since American Standard uses different flush valve bodies across its tank lines and the seals are not interchangeable between them.

A running toilet with water creeping into the bowl is almost always the flush valve seal, the flat rubber ring the flapper or canister seats against at the bottom of the tank. Over time it hardens or picks up mineral scale and stops sealing, so tank water leaks past it continuously. The American Standard 7381042 seal replaces that ring on 4035.216 and 4035.516 tanks. If the water is instead running out the overflow tube, the problem is the fill valve, not this seal.

No tools and no plumber for the seal itself. Shut off the supply, flush to empty the tank, sponge out the residual water, lift the old seal off the flush valve outlet, wipe the seat clean of scale, and drop the new one in place. The 7381042 seats by gravity and water pressure. The whole job is a few minutes, which is why property managers stock these rather than pulling tanks.

Just the seal. The 7381042 is a repair part, sold on its own so you do not have to pull the tank off the bowl to swap a complete flush valve assembly. If the plastic valve body itself is cracked or the threads at the tank bolt are damaged, that is a full valve replacement instead. A hardened or scaled seat surface on an otherwise sound valve body is exactly what this part fixes.

Yes, if your fleet includes 4035.216 or 4035.516 tanks. At 0.026 pounds each the 7381042 stores in a bin with no space cost, and a running toilet is one of the most common and most expensive maintenance calls in multi-family and commercial washrooms because it wastes water continuously between service visits. Buying a handful lets a maintenance tech close the ticket on the first trip.

There is no finish to match. The seal is offered in a single no-finish version because it is rubber and sits inside the tank, out of sight and under water. Toilet color, trip lever finish, and trim have no bearing on which seal you order; only the tank model does.