Keep your tire valves in tip-top shape with Slime's TPMS Valve Caps! Designed specifically for use on vehicles with a tire pressure monitoring system, these valve caps form an airtight seal to prevent pressure loss. In addition, the integrated O-ring blocks our moisture that could cause corrosion. Package contains four TPMS valve caps. Product Features:(4) Black plastic valve capsAvailable in blackTPMS safeThreads onto a Schrader valveIntegrated O-ring to keep out moisture