HP versus LP steel tanks

[matt t.]

Jeff, I used to use bottom stages on trips to extend the gas in my doubles. I liked to have all needed gas for a trip filled before hand whenever possible. By using extra aluminum 80's as bottom stages you can avoid wasting trip time filling tanks and avoid the expense and maintenance on extra sets of steel doubles. With a rebreather, it's become even easier! If you can find a shop that's willing to illegally fill your tank past it's DOT rating I wouldn't brag about it.