Mountain Plumbing’s “Classic” air switch provides safe, convenient disposer activation. No wet hands fear when turning on disposer. Perfect for island or other damp environment installations! For use with ALL continuous feed waste disposers. Round style button with 1-3/8″ mounting hole. Fits 1-1/2″ Thick Deck. No Tools Required for Installation. Air Actuated. Replacement air switch for MT951, MT953, Insinkerator, and Franke push buttons.