Schrader  20158 TPMS Sensor fits Buick Cadillac Chevrolet GMC Hummer (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 TPMS sensors measure tire pressure and transmit this information via radio frequencies All transmitters are sold with cap core grommet and nut for applicable model Schrader AirAware TPMS sensors meet original equipment quality and performance standards Schrader replacement sensors are made to fit specific applications based on vehicle make model and year Depending on vehicle Schrader TPMS sensors also measure tire temperature