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Grav Labs Arcline 5.5' Upright Bubbler The GRAV Arcline Upright Bubbler is 5.5" tall and made on 28mm tubing. Its fission downstem diffuses smoke through water and is fixed inside the pipe to prevent breakage. The beautiful flame polished GRAV label conforms to the Arcline style, inspired by Tuscan columns from ancient Italy. The Arcline Upright Bubbler functions best with approximately 1.5" of water.