EasyPro Diffuser Base"REPLACEMENT AIR DIFFUSER"; model# RD6X6; manufactured by Bubblemac Industries, Inc. makers of"The Forever Bubble Stone", 100% Glass-Bonded Silica Air Diffusers This High-Quality Medium Pore Air Diffuser is designed to "Replace" the Rubber Membrane Diffuser that comes stock with the EasyPro Diffuser Base. If You Are Tired Of Replacing The Diffuser Disk On This Model, Or If You Are Otherwise Unhappy With The Performance Of The Import Disk, Them Try "THE HIGHEST QUALITY AIR DIFFUSER ON THE MARKET TODAY!" {Suggested CFM= 2.8 or 80 lpm} Making This Modification Compatible With Your Current Blower. "Bubblemacs' Replacement Air Diffuser" Boasts A Full 108 Square Inches Of High-Quality Bubble Surface {Top, Bottom and Sides}. The Air-Stone Measures 6" x 6" x 1.5" and comes with a 3/4" MPT Fitting Which Threads Directly Into The EasyPro Base. The Silica Air-Stone Will Outperform The Rubber Membrane Diffuser "Hands-Down." DURABLE, LOW MAINTENANCE and LASTS FOREVER!! This Air Diffuser Design Is Self-Weighted and Provides A Consistant Medium Bubble {1-3MM}. Made In The USA and comes with the Bubblemac No Questions Asked Return Policy. If You Do Not Agree That This Air Diffuser Is Far Superior To Those Offered By The Competetion, Return The Air Stone For A Full Refund! The Pictures Display 1} The EasyPro Single Air Diffuser Base With The "Bubblemac Replacement Air Diffuser", 2} The EasyPro System As It Comes Stock With A Rubber Membrane Diffuser Disk, 3} The EasyPro Base With The "Bubblemac Double Diffuser Replacement Adapter" {This Appliance Is Also Available From Bubblemac Aeration Products.} 4} and 5} Side-By-Side Views Top and Bottom.