Interesting......isn't something like this a "self cleaning" device and apparently "reusable". If the cow injests sharp metallic objects, which are attracted to magnet, wouldn't this cause problems upon exiting the cow? But....if several are added to the fuel system, how they re-covered? Since most automotive fuel tanks are terne coated (Terne metal, an alloy of lead and typically 10 to 15 percent tin, is used to coat steel sheet in order to produce a strong, corrosion-resistant product that is widely used for automobile gasoline tanks, packaging, roofing, and other uses where lead's favourable properties exist) although many now are non metallic (polycarbonate?) that does not rust. Anyway, thanks for the education.....
BOB RENTON