Sierra 18-70931 Molded Hose The Sierra 18-70931 Molded Hose is interchangeable with the following: Mallory 9-44050, Mercruiser 32-96879, 32-47640, 32-8M0071007. Intended for use distribution block to water pump. Each Sierra product meets or exceeds the original equipment part it replaces. Sierra Molded Hose Meets or exceeds the original equipment quality Sierra part number: 18-70931 Interchangeable with the following: Mallory 9-44050, Mercruiser 32-96879, 32-47640, 32-8M0071007