Blocking a pipeline is a requirement during new installation or maintenance when either effluent flow needs to be temporarily stopped or when a new pipe is being air-tested for leaks. Blocking plugs effectively hold back air or water and are used inside a municipal sewer pipe to seal it from outside materials. But until now Cherne’s version of these plugs were limited to use only in pipes 96 inches in diameter or smaller. The I-Series Test-Ball Plug brings the technology up to size, handing pipe from 72 up to an incredible 120 inches.The world’s largest test ball, it blocks flow
