This pushbutton assembly is used for our door functions in our fire service cabinets and comes in two different contact configuration models. Fits in a 22mm or 7/8” hole and can be installed in any similar hole size as a replacement. Voltage: 6V to 110VAC/DC. You can stack the contact blocks if you need additional contact configurations up to three high. Order 716-601 for extra MPB 1 NO and 716-602 MPB for 1 NC contact configuration.