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Anti siphon valve leaking

9K views 3 replies 2 participants last post by  the_man 
#1 ·
On an outdoor frost proof faucet, the siphon valve leaks whenever the water is turned on. I removed the threaded cover piece and found a plastic insert with a center piece that moves. do I need to replace the entire faucet? does this piece come off and can it be replaced? or do I need to do something unknown to stop the leak.
Thanks!
 
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