Check the listing for details. EasyPro Quick Sink Self-Weighted Air Diffuser Assemblies. Condition: New. Listed at 138.74 USD. EasyPro Quick Sink self weighted air diffuser assemblies are designed to be placed at the bottom of a pond or lake. The self weighted design eliminates the need for gravel and reduces installation time. Features round rubber EPDM membrane diffusers with thousands of tiny holes that produce small air bubbles when supplied with air from an on-shore air compressor. These bubbles rise to the surface and create circulation that helps destratify and aerate the water body.Produces fine bubbles for oxygen transfer efficiencyEPDM rubber membrane is low-maintenanceSelf-weighted, powder-coated steel base Barb includes built-in check valve to prevent water leakage into tubingInlet fittings compatible with 3/8", 1/2", or 5/8" airline tubingIncludes strain relief hardware and hose clampsRecommended for fresh water applications only5 year warrantySKUDescriptionInlet FittingsRecommended Air FlowWtQS1Single Diffuser Assembly3/4" MPT x 3/8", 1/2", or 5/8" Barb23-85 Lpm9lb QS2Double Diffuser Assembly45-170 Lpm 11lb