This is a replacement water hose for many Mercruiser stern drive engines from around 1998 and newer. The Quicksilver part number is 32-863453 (also listed as 32-863456A1), and it replaces older numbers 863453 and 863455. It's the hose that connects the thermostat housing to the circulating pump, a common part that can wear out or get brittle over time. The hose comes with the metal fitting and a small attached hose section, just like the original. It's a new part, though it may not be in retail packaging and could have minor storage marks—it's perfectly functional. If you're losing coolant, seeing cracks, or doing routine maintenance on your Mercruiser I/O engine, this is the hose you need. Be sure to verify it fits your specific engine model before ordering. A genuine-style part to keep your boat's cooling system running smoothly.
