Mansfeild flush valve seal wont seal

[Alex Collins]

SO, I have done about 30 of these and they all have the same problem... the old seal had become so conformed and imbedded in the base that the seal was so great that you would break the handle trying to flush. So its time to replace, the new seal is straight and flat and not conformed at all and will not seal unless you lift the handle after every flush for about a month then it seals great. Is there anything I can do to make it seal right away with out lifting the handle.

 

[ShaunCorbs]

You could try putting them into a bucket of hot water first and then install them and push them in while there still hot