PVC return to bulkhead

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Originally Posted by Palmer

How is the union fixed to the threaded adaptor? Since it should be able to be pulled apart I am assuming it is not glued?

Palmer

The union could be close to the TA (threaded adapter) just with a short nipple (made from pipe) or 20 feet away from the bulkhead in the basement.

The TA threads into the bulkhead (use teflon tape or dope), the nipple is glued into the TA and union (unless using a threaded union where you then would have another TA).

If using true union valves make sure they're mounted the right way (see here).