Ensure your car's air conditioning system remains leak-free and functions optimally with these 4Pcs Blue Replacement Valve Caps. Designed specifically for R134a AC systems, these leakproof caps fit securely onto the high and low pressure charging ports, preventing refrigerant leaks and maintaining proper system pressure. Made from durable materials, these caps are built to withstand the rigors of daily driving and extreme weather conditions. Easy to install, simply remove the old caps and screw these replacements on tightly. Keep your vehicle's air conditioning running smoothly and efficiently with these essential replacement valve caps.