Mercury Marine Product Information This Thermostat Gasket 807252T 5 is one of the many available in our large selection of Mercury Marine boat engine parts online. Our online boating store is the number one Mercury engine parts source which makes it extremely easy to find the exact engine parts you need. You can also check out our online to search all Original Equipment Manufacturer OEM boat parts today! Most Mercury Marine boat parts are in stock and ready to be shipped to you.Thermostat-160F: MC GM V6 & V8Part number variations include: 807252T 5/ 807252T5