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 effortless precision!

OPTIMIZE YOUR FLUSH - Maintain peak pressure-assisted efficiency with every flush
SEAMLESS COMPATIBILITY - Fits Flushmate, Kohler, Gerber & more for versatile upgrades
EFFORTLESS INSTALLATION - Get your system running in minutes with simple tools—no plumber needed
DURABILITY YOU CAN TRUST - Engineered for long-lasting, reliable flushing performance
COMPLETE KIT ZERO HASSLE - Includes upper supply assembly and hose clamp for a one-stop replacement

The Flushmate BU100505-KIT is a durable upper supply kit designed for pressure-assisted toilet systems, compatible with multiple Flushmate series and major porcelain brands. It includes all necessary components for quick installation, ensuring consistent water flow and optimal flushing performance.

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€ 29.00

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Manufacturer	Sloan
Part Number	BU100505-K
Item Weight	1.13 ounces
Product Dimensions	6 x 2 x 1.2 inches
Item model number	BU100505-K
Color	Black
Item Package Quantity	1
Included Components	Sloan Flushmate BU-100505-K
Batteries Included?	No
Batteries Required?	No

Flushmate BU100505-KIT Upper Supply Kit for Pressure-Assisted Toilet Systems - Compatible with 503, 503H, 504 Series, Fits Flushmate, Kohler, Gerber, Includes Upper Supply Assembly & Hose Clamp

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