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.
Flush Valve Seal Compatible with Ideal Standard Toilet Cistern, Ancable Replacement Flush Valve Seal & Clip for Ideal Standard Armitage Shanks Flush Valves SV01967 Black
Replacement Flush Valve Seal & Clip for Ideal Standard Armitage Shanks Flush Valves SV01967 (3) White
Dual Flush Toilet Button Kit for 20mm and 40mm Cistern Lid Holes, For Replacement Flush Valve with Brushed Brass Finish, Installation Set for(Black)
Replacement Flush Valve Seal & Clip for Ideal Standard Armitage Shanks Flush Valves SV01967
VIVA SKYLO REPLACEMENT FLUSH VALVE RUBBER SEAL SKY095 *CHEAPEST ON EBAY*
Cistern replacement Flush valve B228 Toilet to Go TORONTO ZONE WINCHESTER
