A/C Pro Ultra Synthetic R-134a Refrigerant helps make recharging your car’s AC easy and accessible. This AC recharge features a proprietary additive formula that seals leaks in rubber hoses, gaskets and O-rings, and protects your AC system while providing 2x cooling boosters, versus the next leading brand of AC recharge kits. Each R-134a refrigerant kit helps eliminate acid and moisture buildup to protect and extend the AC system’s life. This AC leak sealer comes with a reusable, extra-long braided charging hose and Bluetooth gauge for easy, convenient and accurate recharging. To use, find the low-pressure port, turn on the car and AC, read the pressure, and charge the system. Feel empowered to take on DIY car care, and refill the chill yourself with A/C Pro.