Check the listing for details. ALITA EPDM Flexible Membrane Diffuser Discs. Condition: New. Listed at 57.49 USD. SHIPS FREE from Baldwin Park, CA! The ALITA® EPDM Flexible Membrane Diffuser Discs are fine pore diffusers engineered for superior product life, operational flexibility and maximum oxygen transfer efficiency. These units are ideally suited for continuous or on/off applications and require minimal maintenance for long-term efficient performance. Connections Each diffuser has a 3/4" MPT connector, which can be used to attach to any diffuser mount with a 3/4" FPT connection.The Universal Diffuser Mount allows you to install these diffusers on any piping (PVC, ABS, metal, etc.) ranging from 2" to 8". Installation of the Universal Diffuser Mount involves drilled a 1.25" hole, de-burring the hole, installing the UDM (with or without glue) and screwing the diffuser into the mount. Not for use with sidewall mounts.ModelNominal DiameterOverall DiameterActive Surface AreaDesign AirflowMax AirflowWeightDFA77"9.0" (229mm)0.26 sq. ft. (221cm2)3.0 scfm0.5-2.5 scfm1.2lb (0.5kg)DFA99"10.9" (280mm)0.4 sq. ft. (381cm2)6.0 scfm0.5-4.0 scfm1.5lb (0.7kg)DFA1111"13" (334mm)0.66 sq. ft. (610cm2)10.0 scfm1.0-8.0 scfm2.5lb (1.1kg) SpecificationsConnections3/4" MPT (Universal Connector has 3/4" FPT)FeaturesBenefitsTriple Check Valve against Back FlowPrevents entry of solids/liquids into piping, ideal for non-continuous applicationsResistant to Fouling and PluggingHigh oxygen transfer efficiency, minimal maintenancePresicion Die-Cut OpeningsUniform air release, low operating pressureRugged, Heavy Duty ConstructionChemical, temperature, and UV resistanceMounts on any pipe material (PVC, ABS, CPVC, SS, etc)Economical and Easy to Install