a flush valve diaphragm is provided . the diaphragm includes at least two by - passes orifices . each by - pass orifice in the diaphragm has a by - pass associated therewith . each by - pass having a passage therethrough , allows communication with the control chamber above the diaphragm with an inlet chamber below the diaphragm . the diaphragm also integrates the function of locating and providing sealing means to the flush valve system &# 39 ; s aux valve mechanism .