The inner glass tube of the glass allihn condenser is with a series of spherical bubbles to maximize the thermal contact with the cooling water. With serrated glass hose connection having an O.D of 10 mm at the largest serration, to be used with 6 mm I.D. rubber tubing. With 24/40 top outer and bottom inner joint, to be used with any apparatus with 24/40 standard taper joints. The length is 300 mm. Laboy glass are all made of high-quality borosilicate glass and made by hand-blowing to ensure uniform wall thickness.