Our Professional Line of Hakko Air Pumps are durable and rugged units used in the field by our pond construction crew. Built to last and made for outdoor usage, these air pumps can tolerate some serious conditions. An Easy to access air filter allow you to neglect the unit yet, still clean it easily as needed, without breaking out a tool kit. Tested in the field and approved by The Pond Digger construction team. We recommend these air pumps without reservation.