This 65mm polypropylene heavy-gauge funnel is ideal for transferring powders. The parallel stem minimizes bridging of powder while external ribbing prevents air lock. Fast and efficient. Autoclavable. Material: polypropylene. Funnel top I.D.: 65mm. Stem O.D.: 16mm. Stem length: 22mm. Overall height: 67mm. Capacity: 68mL. Nalgene #: 4252-0065.