American Standard Champion Coupling Gasket - AMS-738649

You get the gasket alone. The 738649-0070A is a black rubber coupling gasket for Champion toilets, sold as a genuine American Standard spare part with no bolts, nuts, or tank-to-bowl hardware included. If the brass hardware on your tank is corroded, plan on sourcing that separately.

It is made for select American Standard Champion toilets, not the whole Champion line and not other American Standard families. Champion 4, Champion Pro, and Champion tank models vary, so match your toilet's model number before ordering. American Standard Customer Service at 1-800-442-1902 will confirm the fit for a specific model.

A drip that shows up under the tank where it meets the bowl, rather than at the supply line or the base of the bowl, usually means the tank-to-bowl coupling seal has flattened or split. That is what this rubber gasket replaces. If water is instead running from the tank into the bowl continuously, the problem is the flush valve seal, not this part.

Rubber is the standard sealing material for a tank-to-bowl coupling and it is what American Standard supplies on the Champion. The 738649 is catalogued as a repair part for toilet applications, and it is the same part plumbing pros install on residential and light commercial Champion bowls. For a fleet of restrooms, buy a few spares at once so a leaking tank does not put a stall out of service waiting on a single gasket.

One version only, and it ships black. Finish is listed as NO FINISH because the gasket sits between tank and bowl where nothing shows, so there is no color decision to make when ordering.

The part is listed at 12.913 by 7.5 by 1 and weighs 0.196. That footprint is the packaged card, not the gasket itself, so do not use it to judge the seal diameter against your tank.