i always wanted this regulator but could not justify the cost using those expensive $10 disposable co2 cartridges. i decided to get one and see if i could make an adapter so i could use refillable co2 paintball tanks. i turned the adapter out of aluminum and then bought the appropriate tap and die to cut the the threads. i will use the 20 oz tanks to push my 2 tap jockey box and plan to buy this cool little 3.5 oz tank for dispensing from my 2.5 gallon corny. refills on the 20oz tank are $2 at my local paintball shop.