I have a 1982 Toyota Sunrader 18' motorhome with a Ronco black water tank (59HT-1944) in the bathroom. Does anyone know what kind of plastic they were using to make their black water tanks out of in 1982? (If it matters, this black water tank is actually black in color.) Is it polyethelene? I called Ronco but they are closed until January 2.
Thanks
Steve