Plastic pipes only?.......
I kinda figured when it said RV, it was for the recreational vehicles.
I did follow your link and from what I read, it says its for plastic pipes only. Did I read the wrong stuff?.........I guess it would be o.k. Plastic is softer than aluminum.......the manual only states that you get anti-freeze for aluminum engines (which now days, 90 percent of engines are built with aluminum blocks, so it's probably the primary coolant sold).:cheers: