Glass Joint Adapter, Enlarging,

Used to connect different sized standard taper joint sizes. Made of 3.3 borosilicate glass in U.S.A with high quality joints. Quartz, PTFE, and other materials available upon request. Please inquire for other joint types or sizes not listed.  

With reducing adapters the lower male joint is larger in size than the top female joint.

Enlarging adapters is the opposite, the lower male joint is smaller then the a female joint on top

The length between joints is approximately 1.5x the diameter of the largest joint.