Where is the regulator? Typcial setup w/o a regulator is 5/8″-18 male. The regulator hose has the regulator between the CGA female and 5/8 female. The hose pictured above looks like an extention between the CGA connector for a 25 lb tank. If you run directly off a 1lb tank, my guess is that you already have a regulator in the unit and a female small, propane tank fitting. You need a male small propane CGA to a female 25 lb tank adapter preferably with a hose. I bought the other way around adapter to use a 1lb tank instead of the 25lb from Northern Tools where they had several different types blister packed. Turned out I could buy the same cheaper at our local gas supply from bulk.