RAD4 Rubber Membrane Air Diffuser – 4" – 1/4" – 3/8" barbThese EPDM rubber air diffusers are incredibly strong and are ideal for pond aeration, circulation and destratisfying applications

• Unlike air stones these diffusers are easy to clean
• In testing they produce a slightly larger air bubble than air stones which translates into less oxygen transfer into the water, so for fish holding tanks, raceways, fish production ponds, etc. we recommend air stones
• Barbed inlets have multiple size barbs, simply cut to fit the size tubing you are using
• An excellent choice for pond and water garden aeration since they actually produce more circulation and water movement