Cherne Industries introduced its 72-120 inch Test-Ball Plug. The world’s largest test ball, it blocks flow in the biggest pipes in sanitary and storm sewer systems, up to 120”. Cherne’s 72-120” Test-Ball Plug was carefully developed with an optimized design that offers improved performance and safety. Accommodating a back pressure of up to 6 psi, the plug weighs 850 pounds and is 152 inches long. It is made from tough, tear-resistant natural rubber and features 3/4” eyebolts that provide superior holding strength. A field-replaceable pressure relief valve prevents over-inflation, and an aluminum end plate minimizes rust and corrosion.