This 4 inch pneumatic test-ball winter plug is designed for a variety of applications including winterizing pools by blocking pipes. They can also be used to test drains, tests and waste systems. And they can be used on any type of pipe.
Made from natural rubber, these plugs are tough, tear-resistant and have excellent expansion and memory. The removable zinc-plated steel chain and ring handle act as an anchor to prevent plug from sliding down a line.
