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3″ GRAV® Hammer Bubbler made on 25mm tubing with cross-cut downstem and stabilizing feet.
The small GRAV Hammer Bubbler is 3″ tall and made on 25mm tubing. Its cross-cut downstem diffuses smoke through water, and its feet stabilize the bubbler between uses. No accessories are necessary for using this bubbler, and it functions best with approximately 0.5″ of water.