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Good morning, The elbow joint and sweep Y connection are solvent welded to the valves. In order to replace the valves on our Argosy I had to replcae those pieces along with the valves. Rebuild kits are available for those valves, but given the hassle of changing them out, I chose to go with new. Those valves are expensive, $50-60 bucks a piece. The newer trailers all use Valtera brand valves which are much cheaper, but I not sure they will last 30+ years like the Thedfords. One last thing, resist the urge to use PVC instead of ABS.The PVC is cheaper and easier to get but,the ABS does not get as brittle in cold weather. Sorry, don't mean to steer your thread in a new direction. George.
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