A dual action air sander is a tool which is powered by compressed air.

Dual action air sanders are commonly used for shaping and finishing body filler, and helping to construct contoured surfaces with body filler.

Dual action air sanders get their name from the fact the sanding pad moves in two ways. Most obvious is the spinning motion. Less obvious is the orbital motion which occurs due to the fact the pad rotates around an offset and counterbalanced shaft.