PTFE shaft seals protect the FKM o-rings from contact with the system
· Seal design reduces outgassing
· Designed with a precision external thread for fine control
· Can be used as a bleed up to 1/2 turn
· Full open position is at 1-1/2 turns
· Primary seal is made with a FKM o-ring on a tapered seat
· Non-rotating PTFE shaft
· Manufactured from 33 expansion, low extractable borosilicate glass conforming to USP Type I and ASTM E438, Type I, Class A requirements