I'm not sure I understand correctly, but you don't have a threaded bolt through the hole in the upper spring cup, right? So, you want to center the line from the bag to go through that hole with two 90's and then an inch over the spring cup mount your valves, correct? I would use flex hose just as a precaution. I don't think the upper bag cup would move too much because of the pressure in the bag, but you never know. My upper bag cup is bolted on with a threaded bolt. What I did is made another hole and passed the line through there, then like 1" or 2 over I t'ed it and mounted my valves over the UCA mounts. I hopes this helps a bit.