With full length outer "ground glass"¯ joint on the outer tube and an inner "ground glass"¯joint on the inner tube. The top and side tubulations are the same OD as the center tube and have a length of 75 mm.
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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.