Astral Pool 2" Selector Valve Connection Elbow (4404120041) partypool A switch is useful because A switch is useful because it helps the user activate and control the tool reliably An O ring in this position is useful because lid sealing is one of the most important parts of keeping the chlorinator operating cleanly and without unnecessary leakage or sealing loss The Astral Pool selector valve connection elbow is designed for compatible valve plumbing applications where the line needs to change direction cleanly at the connection point This 2 inch replacement is especially useful when the original elbow is cracked