 Scan QR codes in the porta-potties for a chance to win prizes. Your local events update on 1310 KNOX, brought to you by M&K Porta-Potties, your local porta-potty poo-fessionals. Rust, salt, and time are the biggest enemies for a fuel tank. Never fear, because Grand Forks Welding is here to take care of your enemies for you. Hello, this is Thomas with Grand Forks Welding, and don't fight with rusted-out fuel tanks or bands.