Bruce, I'm not sure if your reply was to me or not...

I mentioned the Hayes tank to the original poster because he seems to want an alternative to a tank with bent metal lines.

To use a Hayes tank for a three line system, I guess you could stand to model on its nose for defueling.

Each installation has to be looked at to determine what will work best. For my PT-60, Astro Hog, and Uproar (all two line setups); the Hayes tanks work great. My Corsair has three lines and has a Dubro tank.