Rubber Membrane Air Diffusers These Rubber Membrane Air Diffusers are incredibly strong and are ideal for pond aeration, circulation, and destratisfying applications Unlike air stones, these Rubber Membrane Air Diffusers are easy to clean In testing Rubber Membrane Air Diffusers produce a slightly larger air bubble than air stones which translates into less oxygen transfer into the water, so for fish holding tanks, raceways, and fish production ponds, 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 New 6" weighted diffuser available, part #RAD650W MPT = Male Pipe Thread SKU # Length Inlet Air Fitting Recommended CFM Airflow Max CFM Airflow Ship Wt. RAD4 4" 1/4" - 3/8" Barb 0.2 1.1 1 lb. RAD6 6" 1/4" - 3/8" Barb 0.4 1.7 1 lb. RAD650 6" 1/2" MPT 0.4 1.7 1 lb. RAD650W 6" 1/2" MPT (weighted) 0.4 1.7 1 lb. RAD8 8" 3/8" - 1/2" Barb 0.7 2.5 1 lb. RAD850 8" 1/2" MPT 0.7 2.5 1 lb. RAD12 12" 3/8" - 1/2" Barb 0.9 3.5 2 lbs. RAD1250 12" 1/2" MPT 0.9 3.5 2 lbs.
