The Synthware™ Storage Tube With High Vacuum Valve manufactured by Kemtech America Inc. comes with high vacuum valve with PTFE O-ring at tip and PTFE wiper ("umbrella") for protecting Viton® O-ring on shaft.
Specification
Material: Glass tube Packaging: Pack of 1 ea Capacity: 50 mL Valve size: 0-4 mm Tube O.D. × L: 28 mm × 120 mm
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Synthware™ Storage Tube With High Vacuum Valve, 100 mL, Valve Size 0-8 mm, Kemtech America Inc. (CAT#: STEM-L-7647-LC)