This Cherne 270016 single-size Test-Ball plug is designed for pressure testing drain, vent, and waste (DWV) systems. Constructed from durable natural rubber, the inflatable body provides an airtight seal in both round and out-of-round pipes. It features a standard tire air fitting for easy inflation and a zinc-plated steel ring and chain assembly to prevent the plug from sliding down the line during testing. Suitable for pipe sizes ranging from 1-1/4 to 1-1/2 inches, it can withstand test pressures up to 13 PSI or 30 feet of head pressure

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