Compatible brands: Aijiren, Dionex, Shimadzu, Tekmar, Aijiren Tech, Varian. Use for TOC, Purge and Trap System. 24-400 TOC PP Caps & Septa. The Sample Storage Vials produced by Aijiren have many different capacities. In order to adapt to different customers, they have 24mm openings and 24-400 standard threads.