Plumbing Test Ball, 4" Test Ball Plug with 16.4ft of Fixed Rope, Rubber Test -Ball Pipe Plug for Repair, Closed Water Test, etc.: Amazon.com: Industrial & Scientific
Pacific Plumbing Supply Company | Cherne® 3 in.- 4 in. Multi-Size Test-Ball® Plug
Cherne, Long Test Ball, Plumbing, 4 inch
Cherne 4-in ABS DWV Long Test-Ball Plug in the ABS DWV Pipe & Fittings department at Lowes.com
Plumber Test Ball Pack
Plumbing Test Ball, 4" Test Ball Plug with 16.4ft of Fixed Rope, Rubber Test -Ball Pipe Plug for Repair, Closed Water Test, etc.: Amazon.com: Industrial & Scientific