The end plug does more than close off the end of the tubing-it also uncaps to provides an easy access point so you can routinely flush your drip system for maintenance or expand your system as needed. The Smart Loc Universal End Plug fits 1/2 in., 5/8 in., and 0.710 in. tubing and dripline sizes, so there is no need to fumble around to find the right size cap to close the end of the hose. Reusable fitting is made of acrylonitrile butadiene styrene (ABS).