Silicone pipes have plenty of advantages, namely durability and easy cleaning. Still, people love old-fashioned glass. Why not have the best of both worlds and use an 18mm to 14mm Silicone Downstem? Using a silicone downstem allows you to keep the diffusion while making it easier to clean and less likely to break. These downstems are meant for 18mm female jointed water pipes and hold 14mm male bowls. They come in not only multiple sizes but colors as well. The 18mm to 14mm Silicone Downstem will make your life easier.