Cherne Plugs are ideal for blocking lines while smoke testing and are the preferred plug of Superior Signal Company. Cherne Plugs have been the professional contractor's choice for over 50 years, and remain the most trusted in the industry. Designed to work with a variety of systems from residential plumbing to municipal storm and sanitary sewer pipe, there is something for every application, and any budget. Cherne Plugs do it all—and Superior Signal offers a broad selection of these products to assist in smoke testing and related jobs. All Regular Kits include a 5% Discount. All DELUXE Kits include a 10% Discount!