Hathoro
RV or marine antifreeze is used when winterizing plumbing so water left in the lines is less likely to freeze and damage them. If your RV stays in freezing-free weather, you may not need it.
RV owners who winterize or store in cold climates.
Capacity in the title: 6 gallons. Confirm on the Amazon listing before you buy.
(6 Gallons) RV & Marine Antifreeze -50°F Burst Protection, 1 Gallon Jugs (ASIN B0HH6PP866). Amazon's page has the current price, specs and reviews.
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Check current Amazon listing (ASIN B0HH6PP866).
Fine print: The Dude has not personally tested this product. The details on this page come from the Amazon listing and can change; check the listing for the current specs, price and availability.