Review on Dorman 609-131 TPMS Aluminum Sealing Valve Cap - Premium Pack of 50 by Randy Holt

problem with these caps. While they look great and feel premium, I believe they are chrome plated aluminum. I put them on my aluminum valve stems and within a year all four were corroding to the melting point with the valve stems. When attempting to remove them, just a slight twisting motion caused the valve stem to shear off under the valve seat (stem was weakened by corrosion), necessitating replacement. If you add some grease or some other anti-rust compound to them they'll probably be fine, but I don't want to risk it. They are probably also suitable for places where the roads are not salted in winter.