All union ball valves are there for maintenance purposes.
If I need to remove the OM unit (to clean the drum for example) or the pump, I can just close those valves and keep the water in the tank.
OMG , What a set up . How much water do you have flowing through that system ? How many gal is your tank ? I love the PVC pump stands . I have got to see the front of that tank . Ted
Mike , I just have one OM 4 way , and I will be using it on my return . It has a version #3 drum as well . I don't have a CL ,and my return line is about 14 " left of center . I'm trying to figure out how I want to plumb the thing . Ted
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