this invention are shown in schematic representation in fig2 a bulkhead or divider wall type of compartmentalizing unit 50 is illustrated while in fig3 an insert tank type of compartmentalizing unit 50 39 is illustrated valve actuator adapter unit 52 is shown in place surrounding valve stem 13 actuator linkage unit 51 is shown attached to flush arm 11 and joined to valve unit 53 as shown units 50 50 39 51 52 53 will be discussed in detail hereinafter referring now specifically to fig2 trip lever 10 is rotated downward rotating flush arm 11 upward until flush valve linkage 12 brings adapter unit 52 into contact with valve stem 13 at a point where flush arm 11 has rotated a very short distance continued rotation of trip lever 10 will cause valve 2 to open as described above if the flush handle 10 is released after opening valve 2 the water in tank 1 minus the water retained by compartmentalizing unit 50 will be free to exit tank 1 as described above permitting a partial discharge of tank 1 however if rotation of flush handle 10 is continued to a location 60 shown dashed linkage unit 51 draws cord 65 taut continued rotation of trip lever 10 will cause flush arm 11 to be rotated to position 61 shown dashed and thereby cause linkage unit 51 acting through connector 55 to raise adapter arm 56 which creates a tension in cord 65 to open valve unit.