Dome Diffuser, Pond Aerator, Airstone, 7" (178-mm) Diameter, With 1/2" Hose Barb This Diffuser Has A 1/2 Inch Barb Fitting And Comes With A Hose Clamp. You Would Need Tubing With A 1/2 Inch ID (Inside Diameter) No Weights Needed, This Diffuser Is Just Over 4 Pounds, And It Will Stay On The Floor This Aluminum Oxide Ceramic Dome Fine Bubble Diffuser Is Excellent For Increasing & Maintaining Your Dissolved Oxygen Levels. These Are Also Designed To Work With Systems That Use Supplemental Pure Oxygen & ozone