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Corning 4980-50 Pyrex Narrow Mouth Erlenmeyer Flask with Heavy Duty Rim, 20 mL capacity-50 mL Capacity Graduation Range, Rubber Stopper Number 1, 51 mm Diameter: Amazon.com: Industrial & Scientific
LabStock 500ml Erlenmeyer Flask, with Rubber Stopper, Pack of 2 : Amazon.in: Industrial & Scientific