5.2″ 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:AD52Length:5.2″CFM:.5AES:8.2Diameter:1.2″Product code: 4692Item No. AE-AAWB5