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.
VIVA SKYLO REPLACEMENT FLUSH VALVE RUBBER SEAL SKY095 *CHEAPEST ON EBAY*
Replacement Spare Optima 49/ 50 Flush Valve Seal Washer For Siamp 34490507
5pc Seal Washer For Siamp For Optima 49/ 50 Spare For The flush Valve 34490507
Feegow Toilet Flush Valve Seal Replacement,Flush Valve Seal & Clip ForIdeal Standard Shanks Flush Valves SV01967 SV89067 Toilet Flush Valve Seal Replacement Toilet Replacement(Black-4pcs)
Whychstore -Dual Flush Toilet Cistern Push Button for Siamp for Optima -49 Toilet, Black Toilet Push Button Dual Flush For Twyford(Black)
Adjustable Dual Flush Toilet Cistern Push Button for Siamp for Optima 49 Toilet Push Button Dual Flush Systems 16-50mm Toilet Push Button (Sliver)
