vvarriale66Yes, the stove will accept other size bottles; Primus sells 2/3 liter and 1 liter bottles which you can use instead of the 1/3 liter bottle supplied. The bottle threads are standard sizes, so other manufacturers' products will also work. The pump is a shiny metal, not plastic. It's not ferromagnetic, so it's not steel/stainless steel/chromed steel. It feels lighter than nickel. Without doing other tests I can't say for certain that it's aluminum, but that would be my guess.