The Cherne 270040 is a 4 inch single-size pneumatic test ball plug designed for pressure testing drain, vent, and waste systems. Constructed from durable natural rubber, it provides an excellent seal in both round and out-of-round pipes. The inflatable design allows for easy insertion through test tees, floor drains, and other tight openings. It features a standard tire air valve for inflation and includes a zinc-plated steel chain and ring handle to prevent the plug from sliding down the line during use

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