This adaptor includes all American made components manufactured by Western Enterprises and packaged by Oxygen Machinery Group in Utah. It’s designed to hook up with an Oxytote oxygen system with a [tool-free] hand-tight deal with. The output end features a male (A-591) CGA 540 fitting to hook up with a high pressure hose. (we have now several to be had here on EBAY). We include a complimentary assembly kit that features (1) roll of 1/2″ by 20′ oxygen-secure thread sealant for pipe threads and a pair of disposable exam gloves to prevent contamination from your flammable body oils.