[Bill_B]

Originally Posted by matthew_martin

I think the best option would be to use Pressure Flow Regulators that are actually fittings that mount on the cylinders themselves. I know you can order then from AndyMark here: http://www.andymark.com/product-p/am-2032.htm
They look kinda like the things in the picture.

Matt could have shown the other side of the fitting which has the symbols for the flow control meter out valve on it. There is also a flow control meter in valve available. I'll try to attach pictures and symbols.