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The lower outlet of this funnel is a standard taper inner joint and has a 0-4 mm Chem-Cap® PTFE plug. The top outer joint is the same size as the lower inner joint. Available in 100 or 250 mL sizes with either a 2 mm glass stopcock with a constant pressure retention device or PTFE Airfree® valve with integral bore and serrated hose nipple on the sidearm.