Thomson Syringe Filters have standard Luer-lok/Luer connections and are either 0.22 or 0.45μm porosities in 4, 13, 25 and 30mm diameters. They are available in a wide selection of membranes, including Nylon, PTFE and PVDF, supporting all common sample preparation applications. A retaining ring seals the polypropylene housing, preventing leaks