This line can be used to create a loop for the corrugated hose/LP inflator hose instead of the length of bungee that came in your kit but typically the bungee is used. The line is just extra and can be used to attach bolt snaps to things like your SPG high pressure hose, your torch, and your primary 2nd stage hose (especially if you are diving with a primary donate setup as it allows you to clip off your 2nd stage when you are out of the water so that it does not hit the ground when you take off your rig).