Originally Posted by
melloveloyellow
I've been using 12g cartridges (Crosman, et. al.) in an Ultraflate w/o problem and w/o spacers for years. I believe the spacer is needed in the Ultraflate2, not the Ultraflate Plus. Here's some confirmation:
Genuine Innovations UltraFlate Plus CO2 Tire Inflator - REI.com
12g CO2 is ~55 cents/cartridge at WallyMart, etc.
This is exactly what i have been using. I bought 12 gm CO2 cartridges from Walmart in a box of 25 for less than $.50 each. For repairing flats with 700-23 tires, I use a mini-pump to get to 20 PSI or so to be sure the tire and tube are seated evenly and the tube holds air. Then a 12 gm cartridge gets me to about 100 psi.