1/2 inch vintage brass steam air whistle valve

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1/2 inch vintage brass steam air whistle valve:
$78.00

vintage brass steam air whistle valve...... It weighs in at 18 ounces
I took pics of the threaded ends so you can
see the condition of the inlet and outlet of the valve.
the spring loaded handle is smooth operating ...note ..the handle is cast iron
I am not sure of the intended use for this valve but I would not hesitate to use it on a whistle or horn.. all in all it is a great valve
it has a great patina