Check the listing for details. ECO270-E | 9” EPDM Fine Bubble Disc Diffuser | SSI Aeration *Original*. Condition: New. Listed at 43.99 USD. ECO270-E | 9” EPDM Fine Bubble Disc Diffuser | SSI Aeration *Original* Design Flow:1.5 - 3.0 SCFM (2.5 - 5.0 Sm3/hr).Flow Range: 0 - 7 SCFM (0 - 12 Sm3/hr).EPDM membrane,2 mm slits - 3/4 MNPT nippleWeight: 1.5 lbs (680.0 g)SSI Diffusers offer high oxygen transfer efficiency, low pressure loss and backflow prevention | 9 inch Fine Bubble Disc Diffuser with EPDM membrane | 2mm slits - 3/4 NPT nipple. Aeration Applications in Ponds, Aquariums, Wastewater Treatment, Lakes, Dock Deicing (Aeration prevents water from freezing). Perfect for Aquaculture and Fish Farms | Aeration also helps Mosquito Control by circulating and agitating the water surface. SSI diffusers are made from advanced membrane materials that offer outstanding resistance to chemicals and fouling. SSI Aeration diffusers have proven highly durable and efficient in thousands of municipal and industrial installations around the world. 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.