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I'm replacing the drain plumbing from my bathroom sink, and there is currently a 1-1/4" male threaded PVC fitting coming from the wall, which I assume is a trap adapter that was installed at some point in the past. I have the nut from it and understand it should tightly clamp around a new piece of pipe, but I can't seem to make it work. There was no gasket there - should there be one? How do I go about attaching the plumbing to this threaded fitting? Thanks in advance for any advice you can provide!!enter image description here

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    Pictures would be very helpful, if you can include a ruler or tape measure for scale that would also be helpful.
    – Eric Urban
    Commented Aug 22, 2018 at 2:08
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    Some PVC connections include a native gasket, while others (like your drain assembly) have a movable one. Without more details I'm not sure we can help you.
    – Machavity
    Commented Aug 22, 2018 at 2:33

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The fitting you show inthe picture is probably a "desanco" fitting. A tail piece or J bend is slipped into the fitting and a gasket and jam nut seal the joint. This J bend is usually part of a P trap assembly. If in doubt, go to a big box store, show them a picture and they can show you what you need.

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It is supposed to have a gasket. Like the one you get with a trap adapter. Install 1 1/4" P trap, then you are good to go.

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