Louis, Lawrie has had a few of these, and I think he sold one not so long ago. You can fill it straight from a fire extinguisher as the one eighth BSP male thread will fit the U.S. thread in the rifle. Press down the extinguisher lever and fill her up. I have the old type extinguisher pipes with the correct thread on the end. Think they are now heat welded on the funnel.
Baz