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Yeah I am thinking that normal valves would work a lot nicer. The only thing is you would have to put in holes to correspond with the parts on trumpet valves so they don't move around inside. That thickness of brass pipe will probably be hard to find. I will get back to you tomorrow afternoon. My laptop is low on battery and I don't have my charger with me. Alse If we don't use trumpet valves. The 3d printed valves top dont slice properly in Cura or Repetier. They Show up in the image but dont print. I have already tried twice.