Camco
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.
Camco RV Antifreeze Hand Pump Kit - RV Winterizing Kit - Protect RV Plumbing & Simplify The RV Winterizing Process - Manually Pump Antifreeze Directly into The RV Waterline & Supply Tanks (36003) (ASIN B0006IX7YW). Amazon's page has the current price, specs and reviews.
As an Amazon Influencer, Dude RV earns from qualifying purchases.
Check current Amazon listing (ASIN B0006IX7YW).
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.