Check the listing for details. ATLANTIC DIFFUSERS AB-70016 Diffuser,Coarse Bubbles,5 in Disc 16G397. Condition: New. Listed at 14.90 USD. Diffuser, Diffuser Type Diffuser Disc, Air Flow Rate (Maximum) 20 scfm, Air Flow Rate (Minimum) 3 scfm, Active Surface Area 32 sq in, Compatible Intake Pipe Size 3/4 in, Minimum Depth Required 6 in, Bubble Type Coarse, Bubble Size 9 to 12 mm, Number of Air Tubing Rolls 0, Number of Compressors 1, Discharge Type Disc, Active Membrane Diameter 5 in, Active Membrane Material EPDM, Air Tubing Diameter 3/4 in, Compatible with Media Type Wastewater, Oxygen, Filtered Water Atlantic Diffusers heavy-duty, rugged coarse bubble disc diffuser offers a high oxygen transfer rate, making it an optimal choice for water aeration/oxygenation use and in water and wastewater treatment applications. The ethylene propylene diene monomer (EPDM) rubber membrane closes over the diffuser inlet when the air supply i.