This 2.5-inch long glass diffuser downstem features a 18.8mm male to 14.5mm female joint, making it compatible with 18.8mm female-jointed water pipes.

Whether you broke the original 2.5-inch long downstem that came with your bong or simply want a spare, this piece will serve you well for a long time. This downstem features a 6-cut diffuser style found on most bongs.