Check the listing for details. AFD350-P Disc Diffuser 12″ | ¾ NPT connection | PTFE | SSI Aeration *Original*. Condition: New. Listed at 64.99 USD. AFD350-P Disc Diffuser 12″ | ¾ NPT connection | PTFE | SSI Aeration *Original*Design Flow: 2.5 - 5.0 SCFM (4.2 - 8.3 Sm3 /hr).Flow Range: 0 - 12 SCFM (0 - 20 Sm3 /hr).Active Surface Area: 0.700 ft 2 (0.065 m2).Weight: 3.0Lbs. (1.4 Kg)PTFE membranes from SSI have a long reputation for improving fouling resistance and the need for cleaning. Compared to standard EPDM membranes from leading manufacturers, these PTFE membranes can improve on these aspects by a factor of five to 10. FINE BUBBLE DISC DIFFUSERS SSI Aeration Fine SSI Bubble Diffusers combine engineering excellence, superior component quality, and a technically advanced product design. Proven highly durable and efficient in thousands of municipal and industrial installations around the world, these advanced systems have reliability built into every stage of performance. Wide variety of uses including: Fish Farms (Aquaculture), Water Treatment Plants (WWTP), Aeration, Agitation with High efficiency low cost oxygen transfer as its main goal. Water Aeration prevents water from freezing, oxygenates water, helps keeps plants and animals in the water aliveLife by Air supplies aeration kits and equipment for all types of water bodies and applications Oxygen transfer for Pond, Lakes, Aquariums, Canals, Commercial Fish Farms, Koi Fish Tanks, Aquaculture, Shrimp Farms, Pool Ponds and more. In aquatic environments like fish ponds, aquariums, lakes or aquaculture projects, oxygen is the single most limiting factor for success | Aeration keeps plants and animals in the water alive | Contact Life by Air for more information.