Ratchet Cap with all PTFE O-rings

Glass Expansion high vacuum glass valves are renowned for their high precision and quality, and are used by leading atmospheric research organisations worldwide. They incorporate glass pistons and are available in either the right angle or straight line configuration with either PTFE or Viton o-rings. They have been tested to 10- 8 Torr and are suitable for use at low temperatures. All Glass valves are made from borosilicate glass subtype "Boro 3.3 (Duran)".