Good advise from previous posts. May I suggest placing the ball valve ABOVE the union so that you can seal off the tank above before disconnecting the plumbing below? Also it may be a good idea to change from rigid PVC to flex or preferably hose for the last leg to the return pump, that section of hose will limit the vibrations from the return pump transmitting through the rest of the system.
As mentioned I would leave atleast a couple inches of pipe between the bulkhead and the next fitting so that you have some meat to cut off and modify the plumbing below if necessary (changes, or if you need to pull the tank off the stand). After that keep things as compact as possible and just glue (PVC cement) everything together that's a slip fitting. In the event that you have to make changes to the plumbing a possible few bucks in fittings will be a small price to pay to have some extra working space in the cabinet. Threads are OK but they can creep salt if you don't thread tape the snot out of them and are pointless if there are any 90's in the line (probably won't be able to rotate the fittings to remove them). Slip fittings will be more compact and easier to assemble. Don't forget to measure twice and cut once!
Last edited by jostafew; 12-14-2011 at 10:36 PM.
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