Dual Flush Flushometer System

A flushometer system comprising:

• a valve body having an inlet, an outlet, and an actuation opening;
• a main valve seat assembly disposed in the valve body between the inlet and the outlet;
• a piston assembly slidably disposed within the valve body and configured for sealing the main valve seat assembly and moving to permit liquid to flow through the main valve seat assembly;
• an actuation module engaged with the valve body, wherein a relief chamber is defined between the actuation module and the piston assembly, the actuation module configured to vent the relief chamber upon actuation,
• wherein the actuation module comprises a first plunger and a second plunger, wherein the first plunger is moveable to vent the relief chamber such that the piston assembly is configured to move a first distance from the main valve seat assembly to permit a first flush volume to flow through the main valve seat assembly,
• wherein the second plunger is moveable to vent the relief chamber such that the piston assembly is configured to move a second distance from the main valve seat assembly that is smaller than the first distance to permit a second flush volume to flow through the main valve seat assembly, and wherein the second flush volume is smaller than the first flush volume.