This bleed valve assembly is designed to go directly in your vacuum line.
Process:
Simply snip the tubing in front of your Pycnometer
Fasten the tubing to each side of the level valve
Open the valve, turn on your vacuum pump
Slowly close the bleed valve until the desired vacuum level is displayed on your manometer
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Colonial Scientific has teamed up with the industry leaders, Fisher Scientific and VWR, and now offers their entire product line. Colonial Scientific provides any part from the Fisher Scientific site with a part number.