Shop Cherne at BPS Supply Group. Our online selection includes mechanical pipe plugs, pneumatic pipe plus and more. Cherne Econ-O-Grip is a trusted brand in the plumbing and construction industry, known for its innovative pipe testing and sealing solutions. Their top-selling products include inflatable pipe plugs and test ball plugs, designed to create secure seals in pipes of various sizes during testing and maintenance. These versatile tools are widely used by professionals to prevent water or debris from entering pipes and ensure they are leak-free, making them indispensable for plumbing inspections and infrastructure projects.