Bubble Magus 3-Channel Dosing Pump Including 3 1.5-Litre Dosing Containers, Mounting Bracket and Tube Holder Automatically Dose your Marine or Reef Aquarium Supplements Controlled by a microprocessor 3 Channel Dosing Pump; Ability to add Slave units for more dosing channels Includes, Tubing, 3 1.5L Dosing Containers, Mounting Bracket and Tube Holder