Ultra-High Temperature Truck Valves. Ultra high temperature green grommet. Designed to operate at temperatures over 400° F. Heat resistant cap & core (red collar). For Drop Center Rims With 5/8" Hole Valve stems used on waste haulers, cement trucks, buses, and other vehicles generating high heat due to operating conditions are vulnerable to leakage at the grommet. Ultra-high temperature valves are designed to operate at temperatures over 400° F. The valve is identified with a green grommet to distinguish it from the imitations on the market. Look for green grommet to be sure. Effective length 3 3/4"