This right-angle high-vacuum valve is designed with a precision external thread for use when fine control is needed. An accurately controlled valve seat and extended tip on the PTFE plug allow control similar to a needle valve for both liquids and gases. The FKM o-ring on the shaft backs up machined-in PTFE ring seals for high vacuum use which shield the o-ring from direct exposure to gases and liquids within the system. Plug is interchangeable with other KONTES® valve bodies of the same size. Manufactured from 33 expansion, low extractable borosilicate glass conforming to USP Type I and ASTM E438, Type I, Class A requirements.