Cylindrical funnels have PTFE "Varibor" metering plug stopcock and double scale graduations

• Turning the adjusting knob allows control of flow rate from dropwise to full flow
• Facilitates reproducible addition rates
• Standard Taper (ST) joint at the top and ST joint with drip tip at the bottom

Manufactured from 33 expansion, low extractable borosilicate glass conforming to USP Type I and ASTM E438, Type I, Class A requirements.

Stoppered models are provided with a glass hex-head stopper.