For automated watering, add a reliable Rain Bird hose end timer (Amazon ASIN B0BMD6534D sold separately)
(1) Rain Bird's Premium Hose End Timer allows irrigation cycles to occur any day of the week, up to four times per day.
(2) The screen filter catches debris, keeping it from entering the line and clogging your devices.
(3) The backflow preventer ensures forward flow only, guarding against any downstream water from contaminating the home's drinking water.
(4) The pressure regulator keeps water pressure at an optimum 25 PSI, so that your drippers and other devices perform as rated.
And last in the connection assembly is a tubing adapter (5). It is sized for the tubing you are using. There are adapters for 1/4" as well as 1/2" tubing.