MEASUREMENT OF DIAPHRAGM APPROXIMATELY: LENGTH : 126MM OR 5;ESSENTIAL REPLACEMENT PRODUCT IF YOU KEEP ON FLUSHING YOUR CISTERN UNTIL BEFORE WATER COMES THROUGH;IDEAL FOR USE WITH 5 SYPHON ALTHOUGH IF FITS TIGHT MIGHT NEED TRIMMING OF EDGES WITH SCISSORS OR CUTTER

• Toilet Cistern Siphon Diaphragm Washer 5 Round (Pack of 2)

Toilet Cistern Siphon Diaphragm Washer 5 Round (Pack of 2)Thunderfix