I have 5 different air/steam engines that I want to run off a common manifold at a steam fair. I will run them all at full (80 pounds) of pressure off an air compressor. Some of these engines are real air hogs, others just need a small amount of air. I plan on regulating the speed of the engines by adjusting the amount of air flowing thru the individual valves. I need to find a source for a manually controlled valve that has a good range of adjustment and has a barb on the outflow end to accept a 1/8" inner diameter neoprene tube. The inflow end should be an NPT thread that I can screw into a home made manifold. The valves will be made of brass. Any good suggestions on where I can source valves like this? (Hopefully in Canada)----Brian