Hope this makes sense, float on the right is attached to the blank by a piece of wire. If the water level rises, the float pops up and the blank releases, opening a hole that is behind it.
Hi,
I think need to replace a toilet siphon unit, as you need to pump the handle to make it flush.
The old one has an internal overflow that is operated by a float (the float is attached to a blank over a hole in the siphon, which pops off if the water level gets too high). However, I can't...