Some regulators have a handle lock. See if the handle will pull out to a
second position where it will easily turn. If the handle doesn't pull out,
is there a rigng around the base of the handle that needs to be pushed or
pulled to unlock the handle?
For a filter, you didn't say what you intend to use the air for. There are
filters, filter/driers, and super versions of them. The choice will depend
on how clean, oil-free, and dry you need the compressed air to be and it
will all be dependent on what you want to use it for.
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