Hi Cliff,
Good question!
It is called a "drip leg".
It is used to "catch" debris, like rust or dirt, and or moisture that may be in or have been introduced into the tank before it can damage the regulator and or gas valves.
Rob
48Rob wrote:<img src="http://img.photobucket.com/albums/v284/1948rob/Cabin%20car%20project/tank2.jpg?t=1234131563">
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