Is it better to use pvc unions or cut and reglue connectors on pool plumbing.


New member
Jun 14, 2019
Huntsville, Alabama
I have to replace the o ring on the valve/tank of my sand filter. The plumbing going in and out is fixed so in order to raise the valve off the tank to get to the o ring I would have to cut the pvc pipes. My question it ok to us pvc screw on unions in the plumbing or is it better to use connectors and re-glue. The former would make it easier to work on the filter as it ages but it also adds more points of failure to the plumbing system. I have a 25,000 SWG inground pool. The pumps and filters are in a room below the pool level.



Mod Squad
TFP Expert
LifeTime Supporter
May 19, 2010
Tucson, AZ
I agree, you want unions up around that multi-port valve so that you can take it off and inspect and clean the sand


Gold Supporter
Oct 10, 2017
I just went through this myself. I got two 1/5" X 2" threaded unions from a local pool store and used those in place of two of the multiport valve fittings. I also got a 2" X 2" slip joint union and used that on the return pipe. I had to do that because as someone here pointed out to me, there is not enough space between the overlapping multiport outlets to accommodate two unions.

In addition to allowing you to replace your O-ring, you can also deep clean your filter at will.