Hi - hope you can help. I have a Gerber toilet with a pilot valve 99-646 and the toilet will not shut off. It looks like the valve is not functioning properly. I have shut the water off to stop it but don't know if I need to replace the valve and if so... how do I do that?:)

Just an update to this. I changed the pilot valve and things are now working fine. Got a Fluidmaster one and it is just as good if not better.

Glad you got all fixed up. If we can ever be of service in the future we're as close as a click. Tom

Agree, Fluidmaster fill-valves are good invention...