Porous polyethylene tubes fit schedule 40 PVC fittings, are highly resilient, lightweight, and resistant to a broad spectrum of chemicals and reagents. The omni-directional, inter-connecting, open-celled pore structure of Porous Plastics can perform as a surface or depth filter; provide wicking of solutions by capillary action; venting or diffusing by controlled flow of gases; or act as a sterile barrier via controlled porosity and inherent tortuous path properties. Also used in aeration, foaming, agitation /sparging operations, and can be modified using conventional machining methods and in some cases hand tools.