Extender Plugs - Open (Brass Wingnuts)

The plugs are made with durable brass hardware, solid rubber, and a brass wingnut. Brass wingnuts are the strongest option, but they require maintenance to avoid corrosion and locking up. Keep in mind that most oil-based lubricants will damage the rubber of the plug, so we recommend using a silicone lubricant.

Straight sided rubber is the best choice for accurate, safe pressure testing in swimming pool plumbing lines, but it’s important to choose the correct sized plug. We recommend choosing a plug size that is about 1/8” smaller than the inside diameter of the pipe opening you are plugging off. The measurement listed for each size is the actual diameter of the unexpanded rubber. Additionally, recommended pipe applications for each size can be seen under “Specifications” once you select a size from the drop-down menu.