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These heavy-wall vials have an internal conical bottom for optimum sample retrieval and a flat base which provides added mechanical strength and bench stability. The vials are graduated at the intervals listed. Available in your choice of 3.0 or 5.0 mL size with 14/10 threaded outer joint. Supplied complete with an open-top screw cap (MW-102-33), Teflon®- faced septa (MW-104-33) and Viton O-ring (MW-100-08).