3.2″ Cylinder Air DiffuserThey produce a bubble size of 1-2mm and require a higher pressure.They have a molded aquere rubber support on each end that supports and protects them from tank bottoms and protects the tank or liner from the diffuser. They fit both 3/16″ and 1/4″ tubing and are 1.2″ diameter.These diffusers are made from alumina that is heat-bonded.They have a molded square rubber support on each end that protects the diffuser from abrasives.They fit both 3/16″ and 1/4″ tubing.Model: AD32Length: 3.2″CFM: .3AES: 5.0Diameter: 1.2″Product code: 4690Item No. AE-AAWB3