PTFE/Silicone Septa, Hand Crimpers, Syringe Filters manufacturer / supplier in China, offering Wholesale 20ml 20mm Crimp Top Gc HS Vials for Gas Chromatography, China Factory Aijiren Crimp Top Glass 20ml Gc Headspace Vial Clear Amber, HPLC Gas Chromatography Vials Caps Pre-Slit PTFE/Silicone Septa Shape I and so on.