Hello. See attached photos. This is of my main drain line coming back to my pump I can't close the valve and should replace it. It does not leak. There is another post where the person was advised to join PVC to poly by using a Male threaded brass barbed fitting and heating the poly to push the fitting into the poly. A nylon fitting was also suggested. My question is - could the gray material be PVC that was a barbed fitting that was previously joined in the same fashion? I am wondering if it is and if so I am wondering if the fitting is also a threaded fitting. I want to change this but fear I am opening a pandora box of problems. If you notice this poly pipe feeds into a larger "conduit" that also appears to be poly. The pool is roughly 60 years old and was hand dug. All of the equipment was in place when I bought the house. I have added a new pump and changed the sand in the sand filter and have done maintenance as needed.
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