12g to 20g Inflator/Pump Adapter
thingiverse
The new Ultraflate inflators don't take unthreaded 16g CO2 cartridges, and all the adapters I've seen here only convert 12g to 16g. The Ultraflate will take an unthreaded 20g cartridge, and this adapter will allow you to use a 12g cartridge. This is especially useful if you have other uses for 12g cartridges, such as with airguns or airsoft, or just want to save money, as 12g cartridges are cheaper, although you will have to carry more. One 12g cartridge gets me ~15 psi on a 29er tire.
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