A tube diffuser BIOFLEX® consists of a support tube with an inside thread and slotted sleeve membrane. Two hose clamps fasten the membrane onto the support tube and an O-seal is applied for sealing between the distribution pipe and the diffuser element. To avoid buoyancy the support tube is flooded. Tube diffusers are usually installed in pairs either by a pipe clamp fixed on a round tube serving as a distribution pipe or by a double nipple inserted into a rectangular tube. When air is supplied, it is directed through the head of the support tube under the membrane. Through the slots of the membrane the air is smoothly dispersed into the wastewater.