Abstract: An apparatus for reducing the outlet bore restriction of the inlet tube of existing outage gauges from a diameter of 0.055 in. to a chosen diameter, thereby reducing the quantity of LP Liquid and/or Gas, or other liquid or gaseous fluid, escaping from an LP Gas tank during filling thereof, is described. By retrofitting the original valve stem of an outage gauge with an adapter having a smaller inlet bore and a smaller stem, which screws into the adapter, the restriction of the outlet bore is achieved without requiring the emptying the LP Gas tank upon which the outage gauge is mounted.