These indoor/outdoor low profile or dome polycarbonate covers protect devices such as dual action pull stations, keypads for entry systems, intercom stations, emergency buttons, electrical light switches, duplex plugs, etc., without restricting legitimate operation. Cover options: dome or low profile, with or without horn, flush mount, surface mount or waterproof back box models. Maximum protrusion is 4 inches deep. This Universal Stopper is a clear, flush mount cover with a yellow horn housing and alarm. Other Universal Stoppers include a surface spacer with conduit knockouts or a waterproof Type 4X enclosed back box. The cover is also available without horn with a message hood. The Universal Stopper is designed to comply with ADA and is less than 4 inches in depth. Other Universal Stoppers include a surface spacer with conduit knockouts or a waterproof Type 4X enclosed back box. The cover is also available without horn with a message hood. Universal Stopper has the same footprint as the Mini Stopper®, but has a larger interior and can accommodate most dual action pull stations.