Patent ID: 7636958

Claim:
A toilet tank flush valve, comprising: a valve body; a valve mounted in the valve body; and a height adjustable overflow tube connected to the valve body, the height adjustable overflow tube comprising a first length of overflow tube having an upper-most portion, an externally threaded top disposed at the upper-most portion, a first circumferential inner wall surface that is disposed at the upper-most portion, a second circumferential inner wall surface that is disposed below the first inner wall surface, and a circumferential inner ledge disposed between the first inner wall surface and the second wall surface; a second length of overflow tube having a bottom, a plurality of fingers, adjacent fingers being separated by a notch and the notches allowing the fingers to flex inwardly, and each finger having a retaining lip for capturing the ledge when the second length of overflow tube is inserted into the first length of overflow tube; and a locknut that, when tightened, locks the second length of overflow tube in place relative to the first length.