Schrader  20154 Replacement Sensor for Retro-Fit Kits (1-pack) Schrader is the global leader in TPMS innovation, design, quality, and technology More than 190 million Schrader sensors are in operation worldwide  more than 54% of the global vehicle market Patented Schrader technology embedded in all OEM and Aftermarket-replacement sensors Schrader offers direct-fit and programmable EZ-sensor replacement sensors Defect-free sensors manufactured in highly-automated, secure Schrader manufacturing environments Schrader AirAware Replacement TPMS sensor is specifically designed to be a replacement sensor for the 20256 and 20257 Retro-Fit aftermarket kits TPMS sensors measure tire pressure and transmit this information via radio frequencies All transmitters are sold with cap core grommet and nut Schrader AirAware TPMS sensors meet original equipment quality and performance standards