20-piece R134A air conditioning service port cap set designed to protect, seal, and extend the life of vehicle AC service ports. Key benefits Prevents refrigerant loss and contamination: rubber-sealed caps help stop leaks, keep out dirt and moisture, and reduce the risk of system damage. Durable and corrosion-resistant: engineered for long-term use under road and under-hood conditions to maintain a reliable seal. Wide compatibility: covers common R134A service port sizes so technicians and DIYers can match caps to a variety of vehicle fittings. Simple installation: quick, secure fit keeps service ports protected between uses and after maintenance. Product details Application: Service port caps for vehicle air conditioning systems using R134A refrigerant. Set size: 20 pieces. Available sizes: 13 mm, 13.5 mm, 14 mm, 16 mm, 17 mm, 17.5 mm. Seal: Each cap includes a rubber gasket to prevent leaks and resist pressure and corrosion. Function: Protects charging/service ports from leaks, contamination and corrosion; supports pressure integrity of the system. Who should use this Professional automotive technicians and repair shops performing AC service and maintenance. Car owners and enthusiasts performing precise DIY AC repairs or routine checks. Practical applications After an AC recharge: fit caps to service ports to maintain pressure and prevent refrigerant escape between uses. During maintenance or storage: protect service ports from dirt, moisture and corrosion when vehicles are parked or being worked on. Workshop use: keep a range of sizes on hand to quickly cap different R134A charging valves encountered across vehicle makes and models. What you get A 20-piece set of R134A service port caps in multiple sizes, each with a rubber seal for leak resistance and durability. Reliable, easy to use and designed specifically for R134A vehicle air conditioning service ports to help maintain system integrity and performance.