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thank you all for the information. I'm going to build a closed loop manifold for my new tank and i wanted it to be made of black PVC so it will blend in with the black background of the tank.
I bought some of the black PVC from Savko to make a rock supposr/spraybar for the new tank. It glues just like regular PVC. There is a much smaller assortment of fittings available, though.