The one-pump Neoprene cover is designed to cover the plastic clamps on most external one-pump systems since 2006. It helps protect the rough edges and corners of the clamp from accidentally cutting, ripping, or putting direct pressure on your canopy when the kite is folded up.
It is easy to apply and this makes sure that the one pump clips won't have a direct contact with the canvas of your kite. So you have less chance of damage on your kiteboarding kites during travel.
There are a couple brands that use a LARGER one-pump hose on their valves, and therefore a larger clamp as well. Airush and Gaastra 2011 and newer are in this category, and there may be others in time. These covers may not fit around these larger clamps.