Check the listing for details. ATLANTIC DIFFUSERS Polypropylene Diffuser, Type: Fine Bubble Disc, 12" Dia. (K). Condition: Open box. Listed at 40.00 USD. PRODUCT DETAILSAtlantic Diffusers heavy-duty, rugged fine 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 is shut down so the diffuser resists backflow and the production of algae, reducing the risk of clogging or fouling.TECHNICAL SPECSItemDiffuserTypeFine Bubble Disc, 12" Dia.Material of ConstructionPolypropyleneActive MembraneEPDMLength (In.)12-1/2Width (In.)12-1/2Height (In.)3-1/2Flow Interference (In.)13-1/2Gallons Mixed/Hour @ 6 Ft. Depth per CFM Air Input8.1Active Surface Area (Sq.-In.)101Fitting Size (In.)3/4" MPTAir Requirements (SCFM)1.0-10.0Ideal ForWater Aeration/OxygenationManufacturers Warranty Length1 YearApplicationWater and Wastewater Treatment