Get a high-quality H3 valve replacement for your Tower inflatable paddleboard. This valve serves as one of the most crucial parts of your iSUP, converting from a 2-way to a 1-way valve by depressing and twisting the center spring. With the center pin spring in the up position, it functions as a 1-way valve, allowing you to inflate the board and remove the pump without losing air. In the down position, it's a 2-way valve that permits you to deflate your iSUP. Please note that a special H3 valve wrench, which is sold separately (but included in all Tower iSUP packages), is required to remove or install the valve.