I do it often, sometimes the threads are bad or the sealing area is warped and teflon tape and pipe dope doesn't fully seal the threaded connection, the O-ring takes care of it - eliminating the need to replace a fitting or MAJOR ($$) part. I try to save the poolowners $ when I can, if I can apply a 'bandaid' that will last a # of years, I do it (I've been kicked out of the 'Pool Store Union' because of this) I use a large pair of channel- locks (~$25 @ Home Depot) to fully tighten all the connections I screw in (up?
). ** as a note, I go by 'hand tight + 1/2 - 1 1/2 turns' when I tighten fittings, unions etc - we're dealing with plastic (for the most part) and you can break it by overtightening**
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