Dorman 974-030 Tire Pressure Monitoring System Sensor Replaceable aluminum valve stem is anodized for long lasting corrosion resistance and may be serviced separately from the entire unit Comes with stem unit, grommet, washer, and hex nut for a complete installation Sensors are designed to accommodate installation angles from 5 to 26 degrees Dorman sensors work with all existing Tire Pressure Monitoring System (TPMS) tools