Outer joint having a tubulation sealed at the midpoint of the ground portion, and a corresponding hole drilled in the inner joint permitting venting of the side tube when the inner joint is turned to the proper position. Both of the 19/38 sizes are compatible with Buchi Rotary Evaporators. Part number CG-132-02 has a single sidearm and a drip tip permitting the seal to be made for the PTFE feed tube. Part number CG-132-03 has two sidearms sealed 180° apart and is used for replacement on the vertical cold trap condenser assembly.