Plugs, stoppers, and inserts fit into holes or cavities and are designed for the ends of shafts, tubes, pipes, fittings, connectors, screws, bars, or other shapes. They are designed to fit inside a ...

They are sometimes integrated with handles or grips. Image Credit: Alliance Plastics Lift/pull tabs and rings allow caps to be easily removed. Pull plugs are designed for "through-hole" applications.