Rearm Kit for FLUID and HELIOS Inflatable PFDs Leland 24 Gram CO with Bayonet. It's called a kit, but it's really just one single CO2 cylinder unit. All you do is open the package to remove it, insert in your jacket and twist to lock. If the indicator window shows GREEN, you've done it. The most simple rearm kit available. Please note: spent cylinders can be RECYCLED.