Durable construction for reliable performance Made from quality copper and brass, these air conditioning valve cores are designed to withstand R134a, oil, and provide watertight performance for longlasting reliability. Complete set with clear sizing Includes 6 small valve cores (approximately 18 mm in length and 4 mm in width) and 3 large valve cores (approximately 20 mm in length and 6 mm in width). Easy replacement and maintenance The kit includes a remover tool, making replacement and maintenance of your car's air conditioning system quick and convenient. Wide compatibility across automotive systems Suitable for various automotive air conditioning systems, these valve cores are a good fit for performance. Practical use scenarios Routine refrigerant service on passenger cars to worn valve cores and maintain system integrity. Fleet maintenance for light trucks and SUVs requiring reliable valve cores for dependable AC operation. DIY garage maintenance to restore leak performance and ensure proper sealing during A/C service.