There are two (really 3) adapters.. Now I do not think Marshall Brass still makes 'em (At least last time I looked they were not in the MB online catalog) but they were called the "Extend-a-Flow" which came in two models one stright through and the other right angle, and the Extend-a-stay, All of these have a Round "Quick Connect" fitting, like you find on the top of a throw-away Propane bottle So any propane grill designed to use throw aways work with them. With an adapter many designed to work with luggable's like the 5 to 25 pounders will as well (Though the really big ones may not)
THe extend-a-stay is designed for Motor Homes like I have.. with this there is a 2nd hose included where you can hook up a luggable tank to feed the RV.. Have done that on occasion. Very handy .