Reviving an old thread as I am about to make a change to my air fittings. OP, any update on what you settled on how it has turned out? Did you end up with the Prevost as originally intended or the Oiteker?
I use the Prevost blue, but beware.....not all air fittings will plug into it. I had one fitting break off, went to the Farm Store and picked up some new ones same size, but the locking ring was just a tad different. It wouldn't allow the Prevost to lock.