Sprinklers should not be installed directly into a supply line. If a sprinkler gets hit or stepped on it can damage the sprinkler or crack the supply line. Swing joints not only protect the sprinkler and supply line, but they also make it easy to adjust the sprinkler to the proper height, angle and placement. A must-have for underground sprinkler installations.
Use a PVC Female Combo Tee to connect the Swing Joint to the PVC supply line.