What is the gray, plastic wrench-like tool for?
Your inflatable paddle board purchase comes with a patch kit and a flat plastic wrench. This seems to throw a lot of people off as they try to figure out what it's used for prior to inflating their board for the first time. This SUP valve wrench is included only for removing the H3 inflation valve IN THE EVENT THAT YOUR VALVE IS NOT WORKING PROPERLY. You can completely ignore this product, but make sure to store it in a safe place incase needed in the future. Most people will never have a need to change out their isup valve, thus never use this gray plastic wrench at all.
If you ever do need to remove the H3 valve, this wrench fits in there around the internal stem and once turned counterclockwise, it will loosen the valve off. Alternatively, you can turn it clockwise to tighten the entire H3 valve. There is a backend to the valve and they screw together like a jar, but with the skin of the inflatable board sandwiched in between. To use the wrench properly, the board has to be mostly deflated and you have to try and grip the inside piece to hold it in place while you turn the outer piece. Because the skin of the board is pretty thick, it's not easy to get a good grip on the back side of this valve. It's difficult, but not impossible. This is exactly how our factory installs these valves.