The Glass Double Coil Condenser for Buchi Rotavap Rotary Evaporator is a high-quality piece of laboratory glassware made of borosilicate glass. It is designed specifically for use in Buchi rotary evaporators and features 19/38 outer and 35/20 inner spherical joints for precise fitting. Manufactured in the United States, this double coil condenser is intended for use in various laboratory disciplines such as biological, dental, medical, and micro. Perfect for those in need of reliable and durable glassware for their research or clinical applications. Some rubber tubing is attached to a couple bottom knobs...see photos...message with questions