Is it compatible with 503?

Hello I found a description for you in the instructions for this product Flushmate Original Part BU100505-K Upper supply kit for all series | BU100504-K | BU100503-K Upper Supply, For Use with All 2-Piece Toilet Configurations, Includes Upper Supply Assembly, O-Ring, Hose Clamp Restrictions Note: Flushmate system is not sold as a retrofit component for a gravity-fed toilet. Flushmate System Pressurized flush eliminates double flush and clogs and saves water. Fewer moving parts extends service life. 1ATR2 is designed to replace any previous generation of Flushmate series, including 500, 501, 501-A, and 501-B (except American Standard fixtures). 2VRN8 is designed to replace series 500, 501, 501A, and 501B in American Standard tank number 4086. Include tank-to-bowl gasket. Flush cartridge, upper supply, and lower supply are replacement parts for all Flushmate systems. This upper supply may sit higher than the upper supply used on the 200, 500, and 501-A series. However, if the porcelain tank lid is resting on the upper supply, it may need to be shimmed up on the opposite side to level it out. Another option is to get a new Flushmate system. Flushmate vessels and components do not retrofit into gravity type toilets. They are only used with Flushmate-equipped toilets.

Does this replace the brass fitting that came on original Flushmate 504?

The fitting I replaced was plastic. However, it didn’t stop the running. There is a small filter in the water inlet that you should remove to increase the pressure. Those flush mate systems also have a recall so you may want to call them before getting too far off into the weeds.

Does this come with the Duckbill Valve?

FYI, I called Sloan and they sold me 4 duckbill valves for $3.66 (on sale), but of course I paid $8 for shipping. still, a better value than this.

What happens in tank if the upper valve goes bad?

The toilet will run. This can also be caused by clogged inlet screen.

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🖤 Upgrade your flush game with sleek, seamless efficiency!

COMPLETE KIT - Includes upper supply and hose clamp for a hassle-free setup
DURABLE DESIGN - Crafted from high-impact plastic for long-lasting performance
PRECISION WATER FLOW - Delivers water directly to the Flushmate for optimal efficiency
SEAMLESS INTEGRATION - Fits all Flushmate series for effortless upgrades
COMPACT LIGHTWEIGHT - Only 32g and 12.7x7.62x7.62 cm—easy to install without bulk

The SloanValve BU100505-K Upper Supply Kit is a compact, durable, and universally compatible component designed to deliver water directly to all Flushmate series pressure vessel tanks. Made from high-impact black plastic, it includes an upper supply and hose clamp for easy installation, ensuring reliable performance and a sleek finish.

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Manufacturer	Sloan
Part Number	BU100505-K
Product Dimensions	15.24 x 5.08 x 3.05 cm; 32 g
Item model number	BU100505-K
Colour	Black
Material	High-Impact Plastic
Item Package Quantity	1
Included Components	Sloan Flushmate BU-100505-K
Batteries included?	No
Batteries Required?	No
Item Weight	32 g

Sloan Valve BU100505-K Sloan Flushmate BU-100505-K Upper Supply Kit for All Series, Black

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