Webster-Matic cast aluminum Quick coupler will speed up sprinkler set up, and eliminate time consuming system shut downs. The ingenious twist and lock system means no tools are needed to place sprinklers in the field. The internal check ball allows you to replace sprinklers while the system is running without getting wet. As well irrigation pipe equipped with Websters are easier to store and handle in the field, and your sprinklers & riser tubing is less-likely to be damaged.