<https://www.envirodesignproducts.com/products/test-ball-6>
<http://schema.org/description>
"Single-Size Test-Ball Plugs\n\nNatural rubber body provides excellent expansion and a great seal in round and out-of-round pipe\nInflatable design can fit through test tees, sanitary tees, floor drains and other hard to access pipe openings\nIdeal for testing DWV plumbing systems at pressures up to 13 psi or with 30 ft. of head pressure\nUtilizes a standard tire air fitting for easy connections\nRing and chain assembly helps prevent the plug from being drawn into DWV systems during tests\n"
<https://www.envirodesignproducts.com/products/test-ball-6>