Check the listing for details. EasyPro QS2 Quick Sink Self Weighted Diffuser Assembly – Double Diffuser. Condition: New. Listed at 189.62 USD. EasyPro Quick Sink Self Weighted Diffuser Assembly – Double Diffuser Quick Sink, self weighted membrane 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. The Quick Sink diffuser assembly features round rubber (EPDM) membrane diffusers with thousands of holes which produce small air bubbles when supplied with air from an on shore compressor. These bubbles rise to the surface and create circulation that helps destratify and aerate the water body. Recommended air flow 1.6 - 6 cfm Low maintenance 10" rubber membrane diffusers Self weighted, powder coated steel base Includes inlet air fittings for 3/8", 1/2" or 5/8" ID tubing Designed for fresh water applications Dimensions: 15" x 22.5" x 4.25" tall Listing and template services provided by inkFrog