Here is my new problem. I called the propane company to fill the 100 gallon propane tank in my 1989 Foretravel. It would not fill. They surmised that the quick fill valve was bad. Ok. So they took the part number off the old one. RegO 7547B.They came back three times over 3 weeks with the wrong part and gave up. Duh? Really? I found a RegO 7547B in 10. Here is where I...