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The 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 percolator for efficient water filtration - Take Smoother and Cooler Hits With The Best Freeze Bubbler.
Glycerin is a gel-like liquid that is able to reach freezing temperatures quicker and stay cold longer than ice without freezing solid and cracking the glass. It is housed in a sealed chamber so it won't melt like ice in a regular ice pinch piece where it then trickles down and overfills the percolation chamber. It's completely safe, non-toxic, and typically found in food and sweeteners.