On Saturday, July 13, 2019 at 8:01:25 AM UTC-7, Tosspot wrote:
A discussion down there --v or up there --^ reminded me CO2 cartridges
come in a least two connectors, threaded and not. I've been caught by this.

Why the difference? Who cam first?

Unthreaded CO2 cartridges are meant to be used in those devices that make carbonated water. I haven't seen a bicycle tire inflation tool that uses them. What's more, most of those fillers have a limited lifespan except for https://www.amazon.com/Genuine-Innov...ateway&sr=8-14 The Chinese seem to be making a machined aluminum version but I can't see why.