Natural rubber body provides excellent expansion and a great seal in round and out-of-round pipe Inflatable design can fit through test tees, sanitary tees, floor drains and other hard to access pipe openings Ideal for testing DWV plumbing systems at pressures up to 13 psi or with 30 ft of head pressure Utilizes a standard tire air fitting for easy connections Ring and chain assembly helps prevent the plug from being drawn into DWV systems during tests 40 ft head Single-size Test-Ball® plug