If you need an adapter with threads to connect AVA to a reel, you can easily do this by using a Female-Female coupling (c) at the end of the hose (b) and an AVA-Male to ¼" threads (d) at the other end.
When you connect these, you get threads that you can use for any high-pressure equipment. AVA doesn't provide adapters for ⅜" or other variations, but you should be able to find them easily at stores that carry pipe fittings or at workshops.