The SynthwareTM Reaction Tube with High Vacuum Valve mnaufactured by Kemtech America Inc. has a high vacuum valve with PTFE o-ring at tip and PTFE wiper ("umbrella") for protecting Viton® O-ring on shaft.
Specification
Material: Glass tube Joint: ST/NS 24/40 Sterility: Non-sterile Graduations: No Packaging: Pack of 1 ea Capacity: 350 mL Valve size: 0-4 mm
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SynthwareTM Reaction Tube With High Vacuum Valve, 250 mL, Joint: ST/NS 24/40, Valve Size 0-4 mm, Kemtech America Inc. (CAT#: STEM-L-1267-LC)