I have a Resun Electromagnetic Blower for sale - R150 excl. shipping. Resun ACO-003 35w Pressure: 0.027 MPa Output: 0.065m³/min Basically it's a monstrously powerful air pump, I used it to drive 4 wooden airstones on my old DIY skimmer and I had to throttle it down to it's bare minimum. Fish shops use these to run airstones in multiple tanks over a long distance. It works perfectly but has signs of being in a salt environment, the screws are rusting and the housing shows sign of salt exposure. But nothing wrong with, it still blows like a ba$tard.