Koller Products Replacement Outflow Hose (OEM Blue) for Rapids Pro Filter, TM1350 and TM1351 Replacement outflow hose for TOM Rapids Pro Filter (models TM1350 and TM1351) and overflow box (model TM1352) 1-1/4-inch diameter; measures 41 inches long Helps filter remove surface contaminants from both fresh water and salt water aquariums