HELIX™ CLEAR STRAIGHT BASE W/ FIXED DOWNSTEM WATER PIPEPRODUCT DETAILS Get everything you love about the Helix collection plus powerful water filtration with the GRAV Helix Straight Base Water Pipe. The fission downstem cleans smoke by diffusing it through water, and it's fixed in place to prevent damage. That smoke is cooled and filtered even more when it reaches the Venturi chamber mouthpiece where three air intake holes swirl the smoke into the iconic Helix tornado. This added air makes your plant