9mm caps are an ideal for replacement on broken or lost 9mm kiteboarding inflate valves. Perfect cap cover for inflating valve on expansive tents, kites, rubber boats, pools, and toys. Small and simple it provides protection to your 9mm valves from dirt and sand and prevent air from going out and very commonly used for 9mm inflate valve. Recommended and notably used by professional kiters and board surfers. Comes in a set of 5.