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We’ve searched far and wide to come up with a rubber membrane diffuser that can generate a ton of air.  This 9” membrane is used in the water treatment industry to really move the water through it’s precision perforated slits.  Unit comes with a built in backflow valve and ½” fittings to plug into your ½” airline.  Rated for up to 5 CFM and perfect for lakes and ponds, especially where you’re only running one diffuser.