Restek’s high-pressure in-line filter is a stand-alone version of the Trident column protection system, specifically designed for ease of use, low dead-volume, and flexibility. The filter has a replaceable, PEEK encapsulated 316 stainless steel frit with a surface area of 12 mm 2 . The . wheel filter 0.22 um syringe filter Restek-Voa Vial