Damn, now I must re-do my OxygenItems again.
EDIT:
What solar should do is make it if you have the airtank avatar piece on your back it extends your oxygen interval.
Thats what my oxygenItems did, I guess I could post them, but they require some slight changes to the old oxygen script, and since there is a new one, i guess i should just let things move on instead of bring back old stuff.
Although i used the brickweapon instead of an oxygen tank on your back... I started such a model in ms3d, but then my trial ran out and I never bought the full version, time to learn blender I guess...