Generic
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: 4 gallon. Confirm on the Amazon listing before you buy.
The title gives a pack size of 4. Confirm on the Amazon listing.
Splash RV/Marine Antifreeze, -50°F Freezing Point, 4 Pack, 4 Gallon (ASIN B0DMQYVS33). Amazon's page has the current price, specs and reviews.
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Check current Amazon listing (ASIN B0DMQYVS33).
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.