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SLIP type PVC union
These views are of a PVC union, and how it unscrews from itself. Connecting to the union can either by with a slip joint that is glued, or a threaded joint that is removable. Click on their pictures for links to each type.
With these on each end of the valves, replacing a valve is easiest by simply unscrewing the coupling ring and lifting the valve up and out.
Alternatively, use an ABS male adapter, threaded into a female threaded union. Follow their links to find in Home Depot.
This would eliminate the rubber couplings needed to attach the ABS to the PVC.
CAUTION: ABS and PVC glue is NOT the same! We recommend you DO NOT glue ABS to PVC with any kind of glue.
Screwing ABS to PVC is fine.
THREADED type PVC union
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