The Synthware™ Storage Flask With High Vacuum Valve and Side Arm manufactured by Kemtech America Inc. features high vacuum valve with PTFE O-ring at tip and PTFE wiper( "umbrella") for protection of Viton® O-ring on shaft.
Specification
Material: Borosilicate glass Packaging: Pack of 1 ea Capacity: 500 mL Valve size: 0-4 mm
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Synthware™ Storage Flask With #15 O-Ring Joint and High Vacuum Valve, 500 mL, Kemtech America Inc. (CAT#: STEM-L-7994-LC)