Replacement iSUP air valve for Tower inflatable paddle boards. This is a high-quality H3 valve, which is one of the most important parts of any inflatable paddleboard. This valve converts from a 2-way value to a one way value by depressing and twisting the center spring. When the center pin spring is in the up position, it's a one way valve that lets you inflate the board and remove the pump without losing air. When in the down position, it's a two way valve that allows you to deflate your iSUP.
To remove your old valve and/or install your new value you will need a special H3 valve wrench, which is sold separately (and is included with all Tower iSUP packages so you may already have one).