2 Pcs Blue Valve Caps for Car Conditioning, Leakproof R134a AC System Charging Port Caps (High and Low Pressure) Valves Caps: These are 2 valve caps for your car's conditioning system, designed to seal the high and low pressure ports. Universal Fit: with most car AC charging ports, providing a secure and tight seal. Leak Prevention: Made with durable materials, these caps provide a leak-proof seal to prevent refrigerant loss in your R134a AC system. Easy Installation: Simple to install and remove, ensuring hassle-maintenance of your vehicle's AC system. Dimensions: Standard size caps to fit most vehicle AC ports.