NRS C7 Leafield Valve Adapter This adapter is especially helpful with high-pressure drop-stitch inflatables such as the NRS Big Earl SUP Board, the NRS Whip Body Board and the NRS GigBob Personal Fishing Cataraft. The threaded male end screws into your Leafield C-7 Valve, sealing the O-ring for an airtight, secure connection. Includes a 2" vinyl hose which allows you to connect the adapter to almost any pump. Sturdy plastic construction withstands use and abuse.