EEZ RV Products EEZTire-TPMS Tire Pressure Monitoring System (TPMS) - Flow Through Sensor (1 ea) Sensor Replaces Existing Valve Caps. Do not use flow-through sensors on rubber valve stems. Flow-through sensors are designed for deep rims and metal valve stems. Long Battery Life, Replaceable Batteries Light Weight  No Need For Rebalancing Tires Monitors Both Pressure and Temperature Water resistant