100x 9-425 Screw Thread Vial Caps, 9mm, PTFE/Silicone Septa for Autosampler HPLC. Features: Screw caps for 9-425 thread vials matched many famous brands very well, such as Aijiren, Shimadzu, Verian waters and ext. Critically measurement the cap thread to make cap and septa are well-sealed. Ultra-clean type specialized for HPLC/GC MS application.