The RD2 plunger releases the air from a vascular cuff rapidly and completely for venous outflow measurements; it can be used with the contoured thigh cuffs and rapid version straight cuffs. The RD2 also works well with either the DS400 or the TD312. Pushing in the plunger quickly exhausts the pressure from the attached cuff. The unique connection system that is also used for the E20 Rapid Cuff Inflator provides maximum cuff exhaust rate. Note that the RD2 is not required if you are using the E20 Rapid Cuff Inflator