I went to the inflatable PFD several years ago because I like the freedom it gives me when paddling and fishing. I always keep a spare Co2 cartridge in the event that one doesn't work or I drop it. My chosen replacement is the Co2 cartridge with the Leland Rearm Kit with the 24 gram cylinder and Halkey-Roberts V86410 Bayonet Assembly. Why? Well that’s the same cartridge that came with the PFD and It works.