The Zeagle 342-0002 2nd Stage Inline Adjusting Tool with 3/16" Hex End, is used to adjust the position of the Orifice in the 2nd stage. The tool is installed between the LP Hose and the inlet to the 2nd stage. The 3/16" hex fits into the opening in the orifice and allows the technician to make final adjustments to the 2nd stage while it is under pressure. Refer to the Zeagle Service Manuals or Videos to see how this tool is used.