EMS Catalog #71230, 71232, 71234
These vacuum desiccators are made from clear polycarbonate. Its stopcock body is made from polypropylene and the plug and washer are made from TEFLON®. The O-ring is made from neoprene.
Unpack the item and check for any damages. If dirty, be sure to wipe the O-ring clean and re-seat in the groove which is located in the flange on the base. Vacuum grease is not necessary to hold full vacuum for 24 hours. If the desiccator is to be held under vacuum for more than 24 hours, you can apply vacuum grease to the O-ring flanges and stopcock valve tapers.
Press the stopcock onto the tapered outlet located on the dome and twist slightly to set the plug. Next, connect a vacuum source tube to the serrated arm on the stopcock. The arrows on the red plug show the orientation in the 3-way stopcock plug. If the vacuum source needs to be removed with a vacuum held in the desiccator, the third stopcock port must be sealed at the same time that the plug is being turned. We recommend using the small red tapered port closure to do this. In order to release the vacuum in the desiccator, the third stopcock port must be unplugged. Then, turn the handle very slowly to open the desiccator to the atmosphere. This should allow the air to enter the desiccator very slowly to avoid disturbing the contents.