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Vacuum Flask Stoppers are used for deairing operations. These stoppers will fit pycnometer flasks like Volumetric Flasks or the No. 4 stopper will also fit Iodine Flasks. All stoppers have single holes with barbed fittings for connection to 3/8in vacuum tubing.
GWA-501 No. 1 Stopper will fit 250ml Volumetric Flasks
GWA-502 No. 2 Stopper will fit 500ml Volumetric Flasks
GWA-503 No. 4 Stopper will fit 1,000ml Volumetric Flasks and all Iodine Flasks
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