Custom Injection Plastic Tapered Protector Thread Plugs Caps / End Caps for Pipes, US $ 0.01 - 0.25 / Piece, , China, jiangzhi, urce from Jiangzhi Machinery Plastic Tapered Cap Plugs. Information. Information. The tapered design of this product allows them to function as both Cap and Plug. For caps, the "C" Dimension must be at least .020" less than the diameter to be capped. For plugs, the "B" dimension must be at least .020" greater than opening. Heat resistance, Fahrenheit.Our pipe caps are avaiuding allmon threading types and vented caps to maintain air pressure during installation. Caplugs also features plugs with our patented Grip It & Rip It™ design, which allows for easier installation and removal. Pipe caps are offeres, with a variety Tapered Plastic Plug Caps have two functions; plug and cap. The Tapered Plug is used to plug the end of tubing, pipes, and bars.Tapered Pipe Plugs are desiged to fit snugly on to the end of a tube to keep liquid, dirt and other ingres out of the cavity - or indeed to help retain the contents that is within. Alternatively, Cap Plugs can be used as Tapered Caps.