Patented, Stainless Steel Bottom-of-the-Bottle Filter Assemblies have an enhanced design that draws solvent from within 1/8" of the bottom of the bottle. It includes convenient, inexpensive replaceable filter cups making it an economical choice. It has a porosity of 2µm and is for 1/8" OD tubing. Our assembly comes with a stainless steel filter cup (A-522) and (1) XP-130 Flangeless Fitting.