I really can't give you an answer on which is better or who to get one from, but just out of curiosity, why do you think you need one? There just isn't much of a need for one unless you're going to be racing it. If it was really necessary, the tank would probably either had one in it, or be set up for one. Most of those valves are really made for use with a racing type feul call, not a street vehicle type tank.
