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Selectronic 3-in. Flush Valve Assembly with Flapper for 4021 Toilet Tank
- To be installed in American Standard Cadet 3 toilets-check actual toilet model repair part information for compatibility
- Provides powerful flush
- Easy to install
- Durable construction
Manufacturer Resources
Product Specs
- Product Type:
- Valve Assembly
- Product Group:
- Washroom/Bath
- Product Subgroup:
- Toilet
- Department:
- Plumbing
American Standard 738921-100.0070A – Frequently Asked Questions
1) Will the American Standard 738921-100 flush valve fit my Cadet 3 toilet?
This Selectronic flush valve assembly is built for the American Standard 4021 tank and is intended for Cadet 3 toilets. Cadet 3 covers a lot of tank models over a lot of years, so match the repair part information for your actual toilet model before you order. If your tank is not a 4021, it's the wrong assembly.
2) Is this a 3-inch flush valve or a 2-inch one?
It's a 3-inch flush valve. That matters because the 3-inch and 2-inch valves are not interchangeable, the flapper and the tank opening are sized differently. A 2-inch flapper will not seal a 3-inch seat, so confirm your tank takes the 3-inch valve before ordering.
3) My toilet keeps running or the tank drains on its own, is replacing the flush valve the fix?
Usually it's the flapper first. If the tank loses water with nobody flushing, the flapper is not sealing on the valve seat. Replacing just the flapper is the cheaper try, but if the seat itself is pitted or scored the flapper won't seal no matter how new it is, and that's when you replace the whole 3-inch valve assembly. This one ships as a valve with the flapper on it, so it covers both failures in one part for a 4021 tank.
4) Does the American Standard 738921-100 come with the flapper, or do I have to buy that separately?
The flapper comes with it. It's a complete flush valve assembly with the flapper included, so you're not sourcing a matching seal on the side. Standard practice on a valve swap is a new tank-to-bowl gasket and bolts, which are not part of this kit.
5) I manage a building with a lot of American Standard toilets. Can I stock one flush valve for all of them?
Not off this part alone. The 738921-100 is specific to the 4021 tank, and American Standard uses different valve assemblies across its tank models, including 2-inch versions. If your fleet is genuinely all 4021 tanks you can standardize on this one, otherwise pull the tank model number off each toilet (it's stamped inside the tank) and match repair parts per model.
6) Does this flush valve work with a Selectronic sensor flush toilet?
Yes, it's the Selectronic 3-inch flush valve assembly for the 4021 tank, so it's the tank-side valve on that sensor-operated setup. It's the mechanical valve and flapper only, not the sensor, the battery module, or the actuator, so if the problem is the electronics you need a different part.
7) What is the manufacturer part number for the American Standard Selectronic 3-inch flush valve with flapper?
The manufacturer part number is 738921-100.0070A. The 0070A suffix is the no-finish designation, which is normal for an in-tank part that never shows.
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Does the American Standard 738921-100.0070A come with a warranty?
Absolutely. The American Standard 738921-100.0070A is backed by a manufacturer’s warranty.
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