Freeze Pipe BubblerThe Freeze Pipe Bubbler is a hammer style bubbler that includes a freezable, glycerin filled chamber that securely snaps onto the bubbler base. Located inside the bubbler is a 6 arm tree perc for efficient water filtration. Attachable glycerin chamber for shockingly smooth hits 6 tree arm percolator provides maximum filtration Smoke is cooled and filtered first through water percolation and then through the frozen glycerin chamber High quality