It seems as if the seal at the bottom of the tank is no longer perfectly planar. It is slowly leaking until the flotation device is low enough to trigger refilling.
I am guessing that this can be fixed by replacing just the part that rotates (name?), and that it is not necessary to replace the entire mechanism.
- Is this accurate? In particular, could the leak be the result of the bottom part of the seal becoming crooked, which would be a lot more complicated to replace?
- Does the rotating part come in a standard size or in one of a variety of few sizes? Does this picture tell you what I should be asking for at the hardware store?
Assuming that the "flapper" (credit for naming it: Michael Karas) is the part attached to the hinge, I noticed that the flapper has another seal attached to it. The seal is made of silicone and is the soft material that stops the water. Is the seal a replaceable part on its own? Alternatively, I do not see which movement will detach the hinge. The material for the axis (as you see in the picutre) is a very thin tube of plastic. Breaking it would mean that a trivial repair would all of a sudden become a serious one.