Shure Bob. The once I got are the third item down at the following link.
http://www.diffuserexpress.com/catalog/flexair_threaded_disc_diffusers.html Don't ask me how good they are, coz this will be my first aerating rig. So, eithe take a chance like me or wait a couple of weeks when I expect to get my rig setup and running and I'll let ya know how it turned out. However,I wont be able to compare to any other once since I never used any. I'll be taking pictures as I go and if I figure out how to upload them, I will post some.
Best of luck friend.
