Why is the Economical RV Plumbing Antifreeze only safe for plastic pipes? Could one use it on a motor boat for winterizing a cooling system made of metal? Is there a problem with the product being in contact with metal? It does not seem to contain any corrosive ingredient.
Our Economical and Premium products contain the same ingredients, but in different proportions.
The reason for the warning is not because of corrosion issues or incompatibilities with metal, but rather because the Economical product exhibits more physical expansion at -50°C and this could damage metal pipes that are inherently less flexible than plastic pipes.