the actuator shaft 15 second the nut 48 is rotated counter clockwise to loosen the actuator shaft 15 the nut 48 does not have to be removed completely it is sufficient that the nut 48 be loosened only enough to provide clearance so that the actuator shaft 15 can be rotated freely third the hexagonal end 50 of the actuator shaft 15 is rotated counter clockwise to unthread the actuator shaft 15 from the insert 14 fourth the retainer sleeve 52 is rotated counter clockwise to raise the retainer bolt 16 to thereby raise the retainer nut 12 and base 11 of the diaphragm 10 this action releases the seal between the diaphragm base 11 and the pedestal 18 or the bottom wall 34 the retainer bolt 16 includes an anti rotation mechanism not shown that prevents rotation but allows axial sliding of the retainer bolt 16 fifth and finally the diaphragm 10 can be removed directly out of the internal cavity in the situation where a two part valve is used or out of the outlet 10 in the situation where an oversized outlet is used the installation of a new diaphragm 10 is performed in the reverse of the removal the many advantages that different embodiments of the present invention provide will now be summarized below existing drain valves whether including diaphragm seals or either o ring and packing style seals all include seals positioned in the bottom wall of the valve body at the lowest point in.