It’s always a good idea to have a spare downstem on hand because downstems do break because they’re handled often. This 3-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 or misplaced the original downstem that came with your bong, or simply want a spare, this diffuser downstem will serve you well for a long time. It features a classic 6-cut style found on most bongs.