A knockout plug is a removable PVC or metal cap designed to temporarily seal openings in plumbing pipes, fittings, or fixtures during construction or testing. It is commonly used to block unused pipe openings, allowing for pressure testing of the system or future expansion. Knockout plugs are easy to install and remove, providing a quick and cost-effective solution for sealing pipe ends without permanent closure. They are often used in drainage systems, vent stacks, and cleanouts to prevent debris, water, or sewer gases from entering the system during installation. Proper removal of knockout plugs is necessary before final system activation to ensure proper flow and function.
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