The thermostat housing with code 11.41100-0626.0 forms the protective and functional enclosure for the cooling water thermostat in the MAN L21/31 engine. This robust housing ensures proper coolant routing, pressure containment, and leak-free operation within the engine’s cooling circuit. Engineered for high thermal resistance and mechanical strength, the thermostat housing plays a vital role in maintaining precise temperature control, safeguarding internal components, and ensuring reliable engine operation under continuous load conditions.