Check the listing for details. NEW 10" Membrane EPDM Disc Diffuser Aeration in Single / Double / 4-Disc W/ BASE. Condition: New. Listed at 124.99 USD. Features & BenefitsMembrane air diffuser assembly that features a hollow base that can be filled with sand or gravelEliminates the need for bricks and straps to get the diffuser to sink!Available in both a single, dual and quad head assembliesHandles airflow from .8 - 3 cfm per head3/4" female threaded outlet located in the base of each diffuser, 1/2" & 3/8" barbed tubing adapter includedMembrane air diffuser assembly features a hollow base that can be filled with sand or gravel. Eliminates the need for bricks and straps to get the diffuser to sink! Available configured with 1, 2, or 4 diffusers.SCFM Range: 0 .8 - 3 CFMMinimum Operating Depth: N/AFlow Interference: N/AActive Surface Area: N/ALinear Lift: N/AInlet Size: 3/4"FPT, barbed adapter included for 1/2" or 3/8" tubing Membrane air diffuser assemblies are designed to be placed at the bottom of a pond or lake. These diffuser assemblies feature round rubber (EPDM) membrane diffusers with thousands of holes which produce small air bubbles when supplied with air from an on shore compressor. These bubble rise to the surface and create circulation that helps destratify and aerate the water body.Membrane Diffuser Assemblies Dual Membrane Diffuser AssemblyMolded base allows for strain relief clamp (included) to secure tubing onto baseHollow base can be filled with sand or gravelEliminates the need for bricks and straps to get the diffuser to sinkLow head pressure lossInlet air fittings (included) accepts 3/8″, 1/2″ or 5/8″ tubingDual head handles airflow from 1.6 – 6 cfm3/4″ female threaded outlet located in the base of each diffuser headLow maintenance rubber membrane diffusers produce fine bubbles for maximum lift and oxygen transfer efficiencyAvailable in both a single, dual and quad head assembliesFive year warrantyRecommended Air flow - 1.6 to 6 cfmWeight - 8