TOC Screw Vials Description. 24mm 40ml Screw Neck purge and Trap vial is manufactured by Aijiren. Pre-cleaning are not available, vials could be used in TOC analysis after cleaning. Compatible Brands: Aijiren, Dionex, Shimadzu, Tekmar, Thermo Scientific, Varian. 24mm Screw neck purge and Trap vial is avaliable amber and Clear.