Caps, Screw Top, Solid, with Silicone Rubber / PTFE Liner, fitted in knurled polypropylene, White Caps. For use with ND20 thread, storage Vials or Bottles. BASIK Brand. 100/PK.
Silicone Rubber / PTFE Liner can be used for use with Storage Vials / Bottles with 20-400mm screw threads. 97020-CV-20.
Also, used with heavy wall reaction vials.