Inside the tall access door on the there is a tube that extends up into the cylinder. There should be a handle that allows the tube to be moved up and down to set the level that the gas can be pumped up into the cylinder. The metal notched fingers allow for setting the tube to 5 one gallon increments. These tubes are usually frozen in place and many times cracked. The handle is available as a repro.

Last edited by wfort39663; Tue Feb 08 2011 04:32 PM.
Bill Fortune