Looking for valve that will work with 720-0021. Will this one fit?

We cannot confirm this valve will fit specific models. However, the most important thing to look for is the angle. This one is 45". If that matches your original, you may be able to make it work. We have universal knobs with different length stems, and there are shorter orifices that will fit on this valve if the orifice that it comes with is too long.