Use the 14mm to 9mm to use a metal popper bowl or glass gravity bowl in a regular 14mm bong joint.
Use the grommet to maintain the seal on a soft glass or acrylic bong if your old one isn't up to the task any longer.
Use the 14mm to 9mm to use a metal popper bowl or glass gravity bowl in a regular 14mm bong joint.
Use the grommet to maintain the seal on a soft glass or acrylic bong if your old one isn't up to the task any longer.