Motorcraft TPMS20 Valve Cap SINGLE VALVE CAP New no-cores AMS flywheels reduce warranty, downtime, and delivery costs. Each flywheel is engineered and manufactured to O.E.M. specifications, using premium grade iron, new ring gears and new dowel pins, which eliminates vibration, slipping, and other serious concerns. Warranty costs and idle rack time are virtually eliminated. Engineered to restore ride, safety and performance