They're called an air switch. Had one for 20 years - never failed. Made for installation on the sink - fits a standard hole like soap dispenser, etc. Great safety feature with wet hands. Easier, faster than reaching up to the wall. Push on, push off, not momentary.
Common feature on a sauna, Jacuzzi, etc.
Last edited by user52165; 05/19/16 09:53 PM.