Flexible silicone tubing for Reef Factory dosing pumps and other devices. Compatibility List: Silicone Tubing 1/3: Reef Factory Dosing pump Pro, KH keeper (ID: 1mm | OD: 3mm) Silicone Tube 10/12: Reef Factory Dosing pump Large (ID: 10mm | OD: 12mm) Silicone Tubing 2/5: Reef Factory Dosing pump, KH keeper Plus (ID: 2mm | OD: 5mm)