GRAV 14mm Fission Downstem 4.5″

The GRAV 14mm Fission Downstem measures 4.5 inches in length. This length is suited to larger beaker bongs and water pipes that require a longer downstem to reach below the waterline. When selecting a replacement downstem, measure the distance from the bottom of the joint opening to just below the water level inside your bong. The 4.5-inch length makes this downstem a practical fit for medium to large-sized water pipes that use 19mm female joints.

The GRAV 14mm Fission Downstem fits into a 19mm female bong joint at the lower end, and accepts a 14mm male bowl or banger at the upper end. Before purchasing, verify that your water pipe has a 19mm female joint opening for the downstem. The 14mm female opening at the top is compatible with the majority of standard 14mm male herb slides and bangers, making it versatile for both dry herb and concentrate use on compatible rigs.

The GRAV 14mm Fission Downstem features fission-style holes that are drilled with a tungsten rod while the borosilicate glass is still hot. This process creates smooth hole edges that reduce the buildup of residue and are less prone to clogging compared to downstems with cut or rough-edged holes. The smooth fission holes also break smoke into fine bubbles as it passes through the water, providing effective diffusion and resulting in a smoother, cooler hit from your bong or water pipe.

The GRAV 14mm Fission Downstem 4.5″ is compatible with any 14mm beaker or straight-based water pipe that has an angled joint and a 19mm female opening for the downstem. The 4.5-inch length is best suited to medium to larger-sized beaker bongs. If your water pipe uses a different downstem diameter or has a non-standard joint configuration, this downstem may not fit. Always measure your current downstem or check your bong specifications before purchasing.

The GRAV 14mm Fission Downstem is made from borosilicate glass. Borosilicate glass is heat-resistant and durable, able to withstand the thermal stress of regular bong use without cracking. It is the same high-quality glass used in laboratory glassware and premium smoking accessories. The clear construction allows you to watch the bubbling action of the fission holes as smoke is diffused through the water, and makes it easy to see when the downstem needs cleaning.

To clean the GRAV 14mm Fission Downstem, remove it from your bong and soak it in isopropyl alcohol for 15 to 30 minutes to dissolve resin and residue. Plug both ends with your fingers or use small silicone caps, add some isopropyl alcohol and coarse salt, then gently shake to help dislodge stubborn buildup. Rinse thoroughly with warm water. The smooth-edged fission holes are designed to resist heavy clogging, making regular cleaning simpler than with downstems that have rougher hole edges.