Specification Brand : Airadyne BulletPoint1 : Efficient long-lasting Cap Diffuser designed to maximize the agitation, mixing, and turning of water and its contents. 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 3/8" NPT threaded fitting/10 -6.0mm air holes/ 1.5 - 10.0 SCFM per diffuser/Overall Diameter: 3-1/4" ExternallyAssignedProductIdentifier : 8225120659217 ItemName : 3" Coarse Bubble Cap Diffuser ItemPackageDimensions_Height : 20 centimeters ItemPackageDimensions_Length : 30 centimeters ItemPackageDimensions_Width : 30 centimeters ItemPackageQuantity : 1 ItemTypeKeyword : pond-filtration-equipment Manufacturer : Airadyne Material : EPDM (Ethylene Propylene Diene Monomer Rubber) ModelNumber : AIR-70002 NumberOfItems : 1 PartNumber : AIR-70002 ProductDescription : Airadyne 3" Coarse Bubble Cap Diffuser ProductSiteLaunchDate : 2015-08-18T07:00:00.000Z Size : 3x7m/10x23ft Style : Garden UnitCount : 1 UnspscCode : 40142000