311930 OMC HOSE

The OMC 311930 is a cooling system outlet hose used in OMC Stringer inboard engines, specifically the 2.5L (120 HP) four-cylinder GM-based models from 1972-1981. This hose carries coolant exiting the engine back to the cooling system circulation, making it a critical component of the raw water cooling loop. The outlet hose works in conjunction with inlet hoses to maintain proper cooling flow and engine temperature regulation. Replacement outlet hoses are commonly needed due to age-related deterioration, salt water corrosion, or blockage; always verify the exact hose routing and size before installation.