retro_restorations & ready_restorations on Instagram: "Fixing a Rusted Radiator + Rare Myson Lockshield Drain Off Explained. In this short, I show a severely rusted radiator that needed replacing and take a closer look at an unusual Myson lockshield drain-off valve. This type works differently from standard valves, so I walk through how it operates before swapping the radiator for a clean, modern unit with new control valves. #radiatorreplacement #radiatorrepair #heatingengineer #plumbinglife #p