Fiber Optic Disposer Switch Controller-Base Unit - Model SX921 - Replacing Waste King FRC-4016 Installs in 5 minutes to your countertop, sink or cabinetry and is perfect for use with an island. Equipped With a 20 second timed shut-off safety feature, which extends the life of your disposer Requires a 3/8" drill hole. Conveniently operates the disposer with a simple press of a button. Controller only. Switch button sold separately, model # FOS-4017