I think he's referring to venting type regulators, which I think would
be most common on air compressor regulators. Venting where you can
reduce the pressure downstream without having to release air elsewhere
The hose should be closed or nearly closed. If open, the regulator may not
be able to pass enough air for the gauge to go up very far.
One way is to set the regulator to the minimum pressure and stop up the
hose. Then turn the regulator up and see if the pressure goes up. You may
have to oepn the end of the hose to let the pressure off.
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