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Product Description Cherne Single-Size Test-Ball Plugs are designed to test drain, vent, and waste systems in every type of pipe. They can seal both round and out-of-round pipe with an inflatable design that fits easily in tight situations, offering broader expansion range than mechanical plugs. A natural rubber body and zinc-plated steel chain offer long term durability so you can test plumbing systems with confidence. Cherne Industries is a global leader in pipe plug, blocking and testing. From the Manufacturer Cherne's Single-Size Test-Ball Plugs. Made of natural rubber for excellent expansion and memory. Seals both round and out-of-round pipe. Zinc-plated steel chain and ring handle acts as an anchor to prevent plug from sliding down a line. Fits easily through test tees, sanitary tees, floor drains, and other "tight" situations. Broader expansion range than mechanical plugs.