This is the washer that holds the water in the toilet cistern. If cistern empties slowly on its own this washer can be the problem.
SIAMP MONACO OPTIMA 49 / 50 FLUSH VALVE OUTLET DIY FIT FIX SEAL WASHER 34490509
Siamp Optima 49 Toilet Flush Valve Dual Flush Water Saving Chrome
Pack of 5X Replacement Flush Valve Seal & Clips for Ideal Standard Armitage Shanks Flush Valves SV01967
Replacement Flush Valve Seal & Clip for Ideal Standard Armitage Shanks Flush
Impresa Products 5-Pack of Kohler -Compatible Canister Flush Valve Seal Replacements for Toilets (Equivalent to K-GP1059291) - Replacement Parts for GP1049291 Tank Canister Gasket Kit
63mmx15mmx3mm Silicone Flush Valve Seal Washer Toilet Accessory
