A Glycerin coil is a freezable liquid that won't turn into a solid. These pipes are specially built to house this chillable liquid, which in turn keeps your pipe's airflow nice and cool. When smoke passes through the glycerin coil, it is chilled and delivers a much smoother, less hot hit of smoke. You can learn more about glycerin coils at on our knowledge base article.
What is Glycerin?
Glycerin itself is a non-toxic liquid usually made of fatty acids that often make their way into our foods as a sweetener or preservative. It’s also a popular moisturizer in soaps. Its high melting point and gel-like consistency upon freezing makes it an ideal alternative to ice in bongs, since it will stay in place and remain frozen for much longer than ice. It freezes quickly, too, so you won’t have to wait hours for it to be ready the way that you would have to with an ice tray.