Economical devices offer polypropylene membranes in a wide range of pore sizes between those of gross paper filters and micro porous membranes used for absolute filtration. Housing is also manufactured from polypropylene with all bonds fused and no extraneous materials such as glues, adhesives, metals, mold release agents or surfactants are used. Stepped barb inlet and outlet fittings take 1/4" to 3/8" (6 to 12 mm) tubing. Typical applications include: general fine filtration, prefiltration, clear air/gas, sample prep, solvents, buffers and reagents.