Old 06-09-15, 11:22 AM
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melloveloyellow
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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.

Last edited by melloveloyellow; 06-09-15 at 11:28 AM. Reason: ..clarity
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