Bluestar International manufactures Three Way Manifold Valves. Bluestar International is an ISO 9001:2000 and 14001:2004 registered company. Bluestar International supplies instrumentation fittings and flanges. Three Way Manifold Valves to flange connection design is suitable for connecting system impulse lines and transmitters. Three Way Manifold Valves consists to ½`` NPT female connections on 54mm [2-18``] centers and of the equalizer valve and two block valves ¼`` NPT purge connections are optional.