Coiled condensers

Similar with graham condenser, the coiled condenser designed with spiral coil inside connecting with the water out and in outlets,throught which the coolant liquid went.The vapor is condensated in the outside area of the  tubing to provide more surface area for cooling. 

With standard interchangable joint at top and bottom,most common sizes are 14/20,19/22,24/40.

Made of borosilicate glass 3.3 by hand-blowing.