Specification Brand : Airadyne BulletPoint1 : Efficient long-lasting Disc Diffuser designed to produce fine bubbles and maximize oxygenation/aeration of water and its contents with an internal check valve for extra protection BulletPoint2 : Membrane diffusers are far less susceptible to clogging or fouling than stone diffusers because the algae cannot clog the membrane BulletPoint3 : The membrane closes over the diffuser inlet which aids in preventing backflow of water into the air supply line BulletPoint4 : This is a low maintenance item, as well as low cost to maintain. The EPDM membranes are replaceable, minimizing the impact on our environment BulletPoint5 : This diffuser has a 3/4" NPT threaded fitting/tiny perforated air holes/1.0 - 10.0 SCFM per diffuser/Overall Diameter: 13-1/4" Capacity : 5 gallons ExternallyAssignedProductIdentifier1 : 0843835001497 ExternallyAssignedProductIdentifier2 : 843835001497 Hazmat : 9 ItemName : 13" Fine Bubble Disc Diffuser w/Integrated Check Valve ItemPackageQuantity : 2 ItemShape : Round ItemTypeKeyword : pond-filtration-equipment Manufacturer : Airadyne Material : Epdm Membranes ModelName : Deluxe Accessory Kit for Powder Coated Windmills ModelNumber : AIR-70014 NumberOfItems : 1 PartNumber : AIR-70014 ProductDescription : Airadyne 13" Fine Bubble Disc Diffuser w/ Integrated Check Valve ProductSiteLaunchDate : 2015-08-18T07:00:00.000Z SupplierDeclaredDgHzRegulation : unknown TargetSpecies : Fish UnitCount : 1 UnspscCode : 40141600