{"product_id":"emp-thermostat-brass-75-00403-br","title":"EMP Thermostat Brass #75-00403-BR","description":"\u003ch2\u003eEMP 75-00403-BR Thermostats \u0026amp; Parts\u003c\/h2\u003e\n\n\u003cp\u003eYour outboard's thermostat is doing quiet, thankless work every time the engine runs. It regulates coolant flow to keep the engine operating in its ideal temperature range, opening to allow flow once the engine reaches operating temperature and closing to retain heat during warm-up. When it fails, the engine either runs too cold and fouls plugs, or overheats and triggers alarms that ruin an otherwise perfectly good day on the water.\u003c\/p\u003e\n\n\u003cp\u003eThe EMP 75-00403-BR is a brass thermostat rated at 147 degrees Fahrenheit, designed for select Mercury and Mariner V6 outboards in the 135 to 200 horsepower range, covering both EFI and carbureted 2-stroke configurations. The brass construction gives it an edge in corrosion resistance compared to standard thermostats, which matters in the saltwater and brackish environments where these engines often spend their time. It is a direct replacement for Sierra part number 18-3553, so if you are cross-referencing from that number, you are in the right place.\u003c\/p\u003e\n\n\u003cp\u003eThermostat replacement is a straightforward job that is easy to include in a seasonal service or tune-up. If your engine has been running cooler than normal, taking longer to reach operating temperature, or throwing overheat warnings without an obvious cause, the thermostat is a logical and inexpensive first step in the diagnosis.\u003c\/p\u003e\n\n\u003cp\u003eCompatibility and specs at a glance:\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eFits select Mercury and Mariner V6 outboards, 135 to 200 horsepower\u003c\/li\u003e\n  \u003cli\u003eCompatible with EFI and carbureted 2-stroke configurations\u003c\/li\u003e\n  \u003cli\u003eOpens at 147 degrees Fahrenheit\u003c\/li\u003e\n  \u003cli\u003eBrass construction for improved corrosion resistance\u003c\/li\u003e\n  \u003cli\u003eReplaces Sierra 18-3553\u003c\/li\u003e\n  \u003cli\u003eBuilt to OEM specifications by EMP\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cb\u003eNormalized SKU:\u003c\/b\u003e 7500403BR\u003cbr\u003e\u003cb\u003eUPC Code:\u003c\/b\u003e 840080411200\u003c\/p\u003e","brand":"EMP","offers":[{"title":"Default Title","offer_id":54081053163825,"sku":"EMP-75-00403-BR","price":22.77,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0015\/7184\/8291\/files\/emp-thermostat-brass-75-00403-br-840080411200-1237294890.jpg?v=1778322771","url":"https:\/\/www.firstchoicemarine.com\/products\/emp-thermostat-brass-75-00403-br","provider":"First Choice Marine","version":"1.0","type":"link"}