Hi just to confirm does this look like a rigid syphon. Not seen in person but doesn't look like it one of the ones that splits so can replace the diaghram. Thanks
I'm not familiar with that particular one, but it looks to me as if you would have to remove the whole siphon from the cistern to replace the diaphragm. Would that be a problem?
As you can see this syphon easily comes apart for future replacement of the syphon washer by unscrewing from the downward flush pipe, thereby eliminating the pin problem. They can be purchased from Wolseley. Hope this helps.