Corning Glass Straight-Bore Stopcock, with PTFE Plug

PTFE STOPCOCKS The more exaggerated taper of this stopcock permits an easier Straight bore stopcock having a 1:5 taper solid PTFE plug.
use at higher-than-ambient temperatures.

With a 1:5 taper PTFE plug and a
threaded pressure nut Manufactured from 33 expansion, low extractable borosilicate glass conforming to USP Type I and ASTM E438, Type I, Class A requirements.