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To clear up any misconceptions, I put a push-on and a tube directly on the compressor, and connected the flow control, which was turned completely SHUT. I started the compressor, and the (obviously unbypassed) pressure blew the flow control off the end of the tube. P o o o h !
Having previously screwed the flow control into the A port on the compressor, and turning the Thomas on, I fiddled with the knob of the still quite effective needle valve. The pressure bled out (unbypassed) through the valve.
I conclude that the flow restriction is bidirectional, not only in one direction.
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