Pneumatic cylinders in chemical industries use two or multi-way pneumatic valves to block or open the hose in heads for in taking by pistons. Some types of valves are used for pressure regulating. http://www.sovereign-sales.com/pneumatics.php
"Home Made Drum Smoker" With the cutting and welding I think this is a good job for Pete. Mmm, maybe its time to buy him the welder he has been wanting. I am sure this is not the only project I can come up for him to use it on.