The AG48WP mounts to a 6" x 6" (customer furnished) wood post that is sunk 30" in the ground and cut off at pool-wall height. Although usually assistant-operated, some people will be able to use this unit independently with an optional stationary handle by pushing or pulling themselves while on the seat. Independent users would rotate themselves close to the pool wall, then lift their legs one at a time over the wall. The standard seat has two arms.