Quote:
Originally Posted by The Guy
I have unions on my return PVC piping to be able to take my check valve out for cleaning and it's never been a problem, just don't over tighten them. Do up hand tight then 1/8- 1/4 turn more with channel lock pliers.
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That's how I tightened one a long time ago and I broke the bond where it was glued on. But I did'nt use primer. As for the o-ring seal i've never had a problem. It's actually a good idea to use unions on external return pumps in case your pump or pump seal goes, much easier than having to cut your plumbing.