This is MTI's rearm kit for the Fluid Belt Pack and Helios inflatable life jackets. . Leland 24 gram CO2 cylinder with a Halkey Roberts V86140 bayonet end is easy to install. Insert the unit into the inflator mechanism, push down, and twist to click into place. Spent cylinders can be recycled. Inspect your inflatable PFD annually always make sure that the indicator shows GREEN before using on water. Due to Department of Transportation restrictions, this product can be shipped only via UPS Ground, and only to the 48 contiguous states.