American Standard 3 inch Toilet Tank Flapper Valve Set - AMS-7381193-200

Measure the flush valve opening in the bottom of the tank, not the flapper you pulled out. The American Standard 3 inch toilet tank flapper valve set fits American Standard toilets built around a 3 in. flush valve. If the drain opening at the tank bottom is roughly the size of a baseball, it's a 3 inch valve and this is the right part; if it's closer to an orange juice can lid, it's a 2 inch valve and this flapper will not seal. Check your tank model before ordering, because American Standard used both sizes.

A toilet that cycles on its own or hisses between uses is usually leaking past the flapper seal, and on a 3 inch American Standard valve this flapper set is the part that fixes it. The rubber seal hardens and warps over time, letting tank water bleed into the bowl until the fill valve kicks back on. Swapping the flapper is a no-tools job for most tanks. If the water level instead runs into the overflow tube, that's the fill valve, not the flapper, and a different part.

It's built for American Standard 3 in. flush valve toilets. Other manufacturers use their own seat geometry and mounting ears on 3 inch valves, so treat this as an American Standard part rather than a cross-brand universal. If the tank is another brand, match the flapper to that manufacturer's valve instead.

One 3 in. flapper valve set, made of rubber. That covers the flapper itself for a 3 inch American Standard flush valve. The chain from your existing flush lever and the tank lever arm are reused, so plan on transferring the chain over and setting the slack so the flapper drops fully closed after each flush.

This is the American Standard part, MPN 7381193-200.0070A. For a property manager or maintenance crew standardizing on American Standard fixtures, ordering the OEM number avoids the fit problems that come with universal flappers, which often sit slightly proud of the seat on a 3 inch valve and weep.

The flapper is rubber. In high-traffic commercial washrooms the usual killer of a flapper is not flush count but chlorine tablets or bleach pucks dropped in the tank, which attack rubber and shorten seal life. If you run a facility on in-tank cleaners, expect to replace flappers on a schedule regardless of the toilet.