Cool thing to do man. Yes, normal impulse o-rings work. Shouldn't be hard to find on ANS or eBay. There are two types of Max-Flo regs. There's a vertical and a horizontal. The horizontal are a bit older. Both can be rebuilt without too much trouble. If you have the horizontal, then the ASA is built in and you may need to place an oring in the ASA. Otherwise the pin in the ASA engages the tank's reg too soon and leaks. The Max-Flo can also be replaced with a newer reg. I replaced mine with a Dye hyper 3 since I had a horizontal that was just too big to use.
Not sure what your end goal is but I hope this helps.
A great resource to use is Impulse-owners.com. Its a less traveled forum, but has tons of impulse information that can help you out.
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Last edited by Twaltz628 : 06-17-2014 at 11:35 PM.