{"title":"Marine Antifreeze \u0026 Boat Winterizing Antifreeze","description":"\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eProtect your boat through freezing temperatures with \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003emarine antifreeze designed for boat winterization\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e. PartsDuck carries antifreeze for marine engines, potable water systems, plumbing, sanitation systems and other onboard equipment that needs protection during winter storage.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eShop \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e-50°F, -60°F and -100°F marine antifreeze\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e for everything from mild winter conditions to extreme cold. Choose from non-toxic propylene glycol formulas, alcohol-free options and antifreeze suitable for drinking water systems and engine winterization.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eWhether you're winterizing an inboard, sterndrive, outboard-powered boat, freshwater system or marine sanitation system, you'll find the right \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eboat antifreeze\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e to help prevent freeze damage and corrosion during the off-season.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eMarine Antifreeze for Boat Winterization\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eMarine antifreeze is formulated specifically for winterizing boats and should not be confused with automotive engine coolant. Depending on the product, marine antifreeze can be used to protect:\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003eMarine engine cooling systems\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003ePotable and freshwater systems\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eWater heaters\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003ePumps and plumbing\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eMarine toilets and sanitation systems\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eHolding tanks\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eBilge and washdown systems\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eOther onboard water lines and equipment\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cspan\u003eChoosing the Right Marine Antifreeze\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eAlways follow the antifreeze manufacturer's instructions and your engine or equipment manufacturer's winterization procedure. Temperature ratings such as \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e-50°F, -60°F and -100°F\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e typically refer to burst protection and should be selected based on your climate, application and winterization method.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eStock up before temperatures drop with individual gallons or money-saving \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003emulti-pack marine antifreeze\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e for larger boats, multiple engines, marinas and professional winterization.\u003c\/span\u003e\u003c\/p\u003e","products":[{"product_id":"50-f-marine-rv-water-system-glycol-alcohol-antifreeze-6-gallons","title":"Marine \u0026 RV Water System Antifreeze -50°F  Glycol\/Alcohol Multipack (6, 12, 24)","description":"\u003cp\u003e\u003cstrong\u003eSeafit -50°F Marine \u0026amp; RV Water System Glycol\/Alcohol Antifreeze, Gallon\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eEnsure your boat or RV is winter-ready with Seafit -50°F Marine \u0026amp; RV Water System Glycol\/Alcohol Antifreeze. Designed for economical and effective winterization, this antifreeze is ideal for protecting potable water systems, ballast tanks, and sanitation systems during the off-season.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhy Choose Seafit -50°F Antifreeze for Your Marine and RV Winterization?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eReliable Cold Weather Protection:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eSeafit provides exceptional burst protection for copper pipes down to -50°F (-46°C), making it perfect for winterizing systems in both boats and RVs in mild to moderately cold climates.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eEasy to Use:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThis antifreeze is ready to use straight from the gallon with no need for dilution, simplifying your winterization process.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eSafe for Potable Water Systems:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eFormulated to be safe for use in drinking water systems, Seafit ensures your potable water remains uncontaminated while protecting against freeze damage.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eBright Red Color Indicator:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThe vivid red color makes it easy to see when the antifreeze has circulated through all water and sanitation system lines, and it helps with system flushing during spring maintenance.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eEconomical Solution:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eSeafit offers an affordable option for winterizing water systems, ballast tanks, and sanitation systems without compromising on quality.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eTemperature Range:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eProvides freeze protection within a range of +6°F (-14°C) to +10°F (-12°C). For more extreme cold climates, consider using non-toxic Pure Oceans antifreeze with a -60°F or -100°F rating for enhanced protection.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eNot for Engines:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eNote that this antifreeze is not suitable for use in engines.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eMeets industry standards for burst protection to -50°F (-46°C)\u003c\/li\u003e\n\u003cli\u003eReady-to-use formula—no dilution required\u003c\/li\u003e\n\u003cli\u003eSafe for potable water systems\u003c\/li\u003e\n\u003cli\u003eBright red\/pink color aids in detection and spring flushing\u003c\/li\u003e\n\u003cli\u003eEconomical and effective for winterizing non-engine systems\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eKeep your boat or RV protected and ready for spring with Seafit -50°F Marine \u0026amp; RV Water System Glycol\/Alcohol Antifreeze. Choose Seafit for a reliable and cost-effective winterization solution.\u003c\/p\u003e","brand":"PartsDuck.com","offers":[{"title":"6 Pack","offer_id":50906052264219,"sku":"B-6-14823330","price":49.99,"currency_code":"USD","in_stock":true},{"title":"12 Pack","offer_id":50906052296987,"sku":"B-12-14823330","price":95.99,"currency_code":"USD","in_stock":true},{"title":"24 Pack","offer_id":50906052329755,"sku":"B-24-14823330","price":190.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0943\/8652\/0347\/files\/K-6x-14823330.png?v=1755719163"},{"product_id":"star-brite-wintersafe-100-f-antifreeze-antigel-gallon-multipack-6-12-24","title":"StarBrite Wintersafe -100°F Marine Boat Antifreeze 031300","description":"\u003cp\u003e\u003cstrong\u003e\u003cem\u003eBuy more save more! HUGE discounts and free shipping over $100\u003c\/em\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cem\u003eProvides engine and potable water system protection in extreme cold environments.\u003c\/em\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eWinterizing your boat for the off-season protects your investment and can prevent costly repairs in the spring. Star Brite WinterSafe -100° (-73°C) Marine Antifreeze provides oustanding cold weather and corrosion protection for drinking water systems, sanitation systems and all engines. Non-toxic formula uses pure virgin propylene glycol for effectiveness and quality. Virgin (not recycled) propylene glycol reduces residual smell and tastes so that drinking water systems are not adversely affected by winterization. Includes corrosion inhibitors to prevent damage to metal engine components and seals. Star Brite WinterSafe is alcohol free to reduce evaporation so that antifreeze maintains same concentration and protection throughout the storage season. The intense blue color lets users know when antifreeze has traveled through water lines, sanitation system lines or engine cooling systems and serves as an indicator when flushing systems in the spring. Star Brite WinterSafe is the professional choice for winterizing potable water systems, sanitation systems and engines.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eKey Features\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eNon-toxic virgin propylene glycol formula\u003c\/li\u003e\n\u003cli\u003eSafe for potable water systems and engines\u003c\/li\u003e\n\u003cli\u003eAdded inhibitors prevent corrosion in engine components and seals including aluminum, brass, copper and solder\u003c\/li\u003e\n\u003cli\u003eReady to use—does not need to be diluted\u003c\/li\u003e\n\u003cli\u003eAlcohol free to reduce evaporation and maintain protection of areas of pooled water\u003c\/li\u003e\n\u003cli\u003eMeets industry standards for burst protection in copper pipes to -100° (-73°C)\u003c\/li\u003e\n\u003cli\u003eIdeal for colder regions that experience low temperature ranges between -58°F to -63°F (-50°C to -52°C)\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"PartsDuck.com","offers":[{"title":"3 Pack","offer_id":51003938177307,"sku":"B-3-031300","price":49.99,"currency_code":"USD","in_stock":true},{"title":"6 Pack","offer_id":50906275184923,"sku":"B-6-031300","price":95.99,"currency_code":"USD","in_stock":true},{"title":"12 Pack","offer_id":50906275217691,"sku":"B-12-031300","price":189.99,"currency_code":"USD","in_stock":true},{"title":"24 Pack","offer_id":50906275250459,"sku":"B-24-031300","price":379.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0943\/8652\/0347\/files\/B-3-031300.png?v=1757009359"},{"product_id":"wintersafe-50-f-professional-grade-antifreeze-gallon","title":"Starbrite WinterSafe -50°F Antifreeze Gallon Multipack (3,6,12,24,55)","description":"\u003cp class=\"MsoNormal\"\u003e\u003cb\u003eProfessional-Grade Protection for Marine Water Systems and Engines\u003c\/b\u003e\u003c\/p\u003e\n\u003cp class=\"MsoNormal\"\u003eProtect your boat during the off-season with Star brite WinterSafe -50°F (-46°C) Marine Antifreeze. Designed for reliable cold-weather and corrosion protection, WinterSafe is ideal for winterizing potable water systems, sanitation systems, and marine engines.\u003c\/p\u003e\n\u003cp class=\"MsoNormal\"\u003eIts non-toxic formula is made with high-quality virgin propylene glycol, helping minimize residual odors and tastes in drinking water systems after winterization. Added corrosion inhibitors help protect metal engine components, seals, and plumbing materials from damage during storage.\u003c\/p\u003e\n\u003cp class=\"MsoNormal\"\u003eWinterSafe is also alcohol-free, reducing evaporation so the antifreeze maintains its concentration and continues protecting throughout the storage season. Its bright pink color makes it easy to see when the antifreeze has fully circulated through water lines, sanitation systems, and engine cooling passages, while also helping indicate when systems have been completely flushed in the spring.\u003c\/p\u003e\n\u003cp class=\"MsoNormal\"\u003eAn excellent choice for boats stored in areas that experience mild to moderate freezing temperatures.\u003c\/p\u003e\n\u003cp class=\"MsoNormal\"\u003e\u003cb\u003eKey Features\u003c\/b\u003e\u003c\/p\u003e\n\u003cul style=\"margin-top: 0in;\" type=\"disc\"\u003e\n\u003cli class=\"MsoNormal\" style=\"mso-list: l0 level1 lfo1; tab-stops: list .5in;\"\u003eNon-toxic virgin propylene glycol formula\u003c\/li\u003e\n\u003cli class=\"MsoNormal\" style=\"mso-list: l0 level1 lfo1; tab-stops: list .5in;\"\u003eSuitable for potable water systems, sanitation systems, and marine engines\u003c\/li\u003e\n\u003cli class=\"MsoNormal\" style=\"mso-list: l0 level1 lfo1; tab-stops: list .5in;\"\u003eHelps protect against corrosion in aluminum, brass, copper, solder, engine components, and seals\u003c\/li\u003e\n\u003cli class=\"MsoNormal\" style=\"mso-list: l0 level1 lfo1; tab-stops: list .5in;\"\u003eReady to use — no dilution required\u003c\/li\u003e\n\u003cli class=\"MsoNormal\" style=\"mso-list: l0 level1 lfo1; tab-stops: list .5in;\"\u003eProvides burst protection in copper pipes down to -50°F (-46°C)\u003c\/li\u003e\n\u003cli class=\"MsoNormal\" style=\"mso-list: l0 level1 lfo1; tab-stops: list .5in;\"\u003eAlcohol-free formula helps reduce evaporation during long-term storage\u003c\/li\u003e\n\u003cli class=\"MsoNormal\" style=\"mso-list: l0 level1 lfo1; tab-stops: list .5in;\"\u003eBright pink color makes circulation and spring flushing easy to identify\u003c\/li\u003e\n\u003cli class=\"MsoNormal\" style=\"mso-list: l0 level1 lfo1; tab-stops: list .5in;\"\u003eRecommended for areas where typical winter temperatures range from approximately 14°F to 18°F (-10°C to -8°C)\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Starbrite","offers":[{"title":"3 Pack","offer_id":52807897284891,"sku":"B-3-031200","price":25.99,"currency_code":"USD","in_stock":true},{"title":"6 Pack","offer_id":52807897317659,"sku":"B-6-031200","price":49.99,"currency_code":"USD","in_stock":true},{"title":"12 Pack","offer_id":52807897350427,"sku":"B-12-031200","price":97.99,"currency_code":"USD","in_stock":true},{"title":"24 Pack","offer_id":52807897383195,"sku":"B-24-031200","price":195.99,"currency_code":"USD","in_stock":true},{"title":"55 Gallon Drum","offer_id":52807969571099,"sku":"314G55","price":449.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0943\/8652\/0347\/files\/ChatGPT_Image_Aug_13_2026_12_01_32_PM_1.png?v=1786636972"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0943\/8652\/0347\/collections\/2868f312-a0da-41a2-ac4e-fc4527ac00e5_1.png?v=1786723154","url":"https:\/\/partsduck.com\/collections\/marine-antifreeze.oembed","provider":"PartsDuck.com","version":"1.0","type":"link"}