Large receiver/evaporator flasks for use with Heidolph 20L rotary evaporators. Flasks are fabricated from blanks selected for balance and quality with carefully welded necks to provent "rotational whip". Receiver flask has a polished 40/25 joint, side neck is a GL-18 thread with solid cap. Bottom of receiver flask has a 0-10mm easy action stopcock with GL-18 side arm and comes supplied with a 3/8" connection tube. Evaporator flasks (Laborota only) feature a 143mm OD flange and can be ambered or plastic coated on request.