Backflow valve leaking

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Jenrice

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Can someone help me with this. The brass nut is going to be the end of me (nut not currently on). I’ve tried teflon tape and it still leaks like a sieve. Can you help me figure out what it’s purpose is and how to keep it from leaking?
 

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Twowaxhack

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JG plumbing

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You don't need Teflon tape or anything just the caps twowax linked to. The rubber seal in your cap has rotted out.
 

Jenrice

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Awesome! Thank you so much! I had a feeling there might have been a rubber seal in there at one point.
 

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