If you get a nitrogen tank adapter you can use a co2 regulator that it comes with unit. The fittings to the tank are different. http://www.amazon.com/dp/B000CC27MK/?tag=skimlinks_replacement-20
Mine came off fairly easy. I didn't have to use any tools. I bent the metal back as normal as I could get it then put the clear plastic piece back on. Good luck, hope that it works out for you!