Float> I believe it is a single outlet that has to be manifolded. I do not know if Koender has theres in production or not but Superior does, Send a note to Corey Michel at Superior at their website and he will be glad to give you any specs.I find them very willing to provide information.They also have a "superior " diffuser for most applications compared to airstones >> my 2 cents, Ted PS Bill C. What is the latest on the Koender dual diaphram ??
