It can be used to inflate or deflate your board. Used this to pump up 2 inflatable kayaks. Good to have a gauge to use, don't have to worry about over inflating.

Overall very satisfied. Will update the review over the course of use but for now, very happy with the purchase. A couple of tips:1.

Easy to connect, easy to set pressure, et c. Easy to operate. I was really impressed about how light and easy to use this pum.

Filled up my 15psi paddle board in about a minute. Turn it on, set it to 15 psi and start getting ready for paddling.

Used with a c02 tank to fill up an air mattress, worked great. However, they all look sturdy.