Most all al100's are 3300 psi to fill. only maui dreams commercial fill station does any fills over 3000 but they don't even fill the al100's to 3300. only HP steels do they "bump" to 3440.Shops that rent AL100s that are filled to 2900psi crack me up. You get a balloon with not that much more air than an AL80. I've yet to see a tropical dive shop that fill those properly.