The Bubble Trap eliminates turbulence bubbles and micro-bubbles caused by additives and/or high organics in the tank. Attaches to the outlet elbow of the Bak-Pak 2. Measures 5" x 7" x 2". Black color.The Bak-Pak Pre-skimmer fits around the power head and skims water from the aquarium surface where wastes accumulate. The Pre-skimmer makes the Bak-Pak even more efficient Measures 5" x 8" x 2-1/2".Downloadable Bak-Pak Bubble Trap Instructions PDF. Downloadable Bak-Pak Pre-Skimmer Instructions PDF. (Both requires Adobe Acrobat Reader 4.0 or later - get it here for free)

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