DX Engineering Vinyl End Caps are designed to fit over the end of tubing or pipe to keep moisture out. Open vertical tubing serves as a collection point for rain water. By keeping water out of the tube end, you reduce corrosion and prevent any collected water from bursting the tubing when it freezes. DX Engineering vinyl end caps are also perfect for sealing off booms and Yagi antenna elements. Made from strong UV-rated material, DX Engineering Vinyl End Caps will withstand the abuse of nature and keep your installation safe and good looking for years.