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.

ASIN	B0057XUDGG
Brand	Flushmate
Brand Name	Flushmate
Connector Type	Flushmate specific
Customer Reviews	4.6 out of 5 stars 268 Reviews
Exterior Finish	Black
Exterior finish	Black
Included Components	Sloan Flushmate BU-100505-K
Inlet Connection Size	1.25 Millimeters
Inlet Connection Type	Flushmate specific
Inlet connection size	1.25 Millimeters
Inlet connection type	Flushmate specific
Item Dimensions	7.6 x 5.1 x 5.1 centimeters
Item Type Name	Sloan Flushmate BU-100505-K Upper Supply Kit for all series
Item dimensions L x W x H	7.6 x 5.1 x 5.1 centimeters
Manufacturer	Sloan
Material	High-Impact Plastic
Material Type	High-Impact Plastic
Model Number	ST100500
Outlet Connection Size	1.25 Millimeters
Outlet Connection Type	Flushmate specific
Thread Size	1.25 inches
Thread Type	Flushmate specific
UPC	064871430052
Unit Count	1.0 Count

Sloan Flushmate - Upper Supply, BU100505-KIT

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