https://www.canadiantire.ca/en/pdp/plumbshop-mansfield-rubber-flush-valve-seal-gasket-0630549p.html
PlumbShop Mansfield Rubber Flush Valve Seal/Gasket | Canadian Tire
The PlumbShop Mansfield Rubber Flush Valve Seal/Gasket is a simple fix to eliminate toilet woes. With time, your toilet's rubber flush valve seal can...
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https://www.acehardware.com/departments/plumbing/toilets/toilet-repair-parts/4838843
Keeney Flush Valve Seal Red For American Standard Mfr# K836-94 - Ace Hardware
flush valve seal