WINTER PRUF WINTER PRUF® Antifreeze - Trusted OEM Supplier | Non-Toxic, Alcohol-Free | Safe for RVs and Marine | Made in USA | Burst Protection to -100°F

Winter Pruf Antifreeze Trusted by leading OEMs like Jacob, Keystone, Thor, Forest River, Newmar, Tiffin, and REV, Winter Pruf Antifreeze has earned its reputation with over 50 years of trademark excellence and zero warranty claims. This product stands as a testament to quality and reliability. Safe and Non-Toxic Formula Winter Pruf Antifreeze is a non-toxic, alcohol-free formula that is GRAS (generally recognized as safe). It lubricates seals and gaskets without drying them out, ensuring optimal performance and longevity. The propylene glycol base enhances its lubrication properties. Versatile Protection This antifreeze is safe for use in RVs and marine engines, and will not harm plastic, copper, brass, or steel plumbing. It provides superior burst protection down to -50°F when used according to label directions, safeguarding your systems even in extreme conditions. Ideal for Drinking Water Systems Winter Pruf Antifreeze is also safe for RV and marine drinking water systems, making it ideal for winter storage to prevent frozen lines. It comes in both a ready-to-use -100°F formula and a -50°F concentrate, meeting a wide range of needs. Made in the USA Proudly made in the USA, Winter Pruf Antifreeze embodies 50 years of dedication to quality. Choose the trusted product for reliable protection of your RV and marine systems. Trusted OEM Supplier: Used by Jacob, Keystone, Thor, Forest River, Newmar, Tiffin, and REV. 50 Years of Excellence: Celebrating 50 years with zero warranty claims. Propylene Glycol Based: Non-toxic, alcohol-free formula that is GRAS (generally recognized as safe). Lubricates seals and gaskets without drying them out. Safe for drinking water systems during winter storage to prevent frozen lines. Safe for RVs and Marine Engines: Will not harm plastic, copper, brass, or steel plumbing. Superior Burst Protection: Protects to -50°F / -100°F when used as directed, ideal for winter storage in RV and marine drinking water systems. See more product details