Compatible with many refrigerants: Our professional four-way manifold gauge set is compatible with R134a R404A R404z R410A R12 R22 refrigerants. The AC gauge set is suitable for automotive car HVAC, household air-conditioning, and refrigerator maintenance. You can easily enjoy the DIY operation process at home. 3 PCS Reinforced Hoses: Our ultra-long 5-foot Freon hoses come in a set of four and are made of PVC with four reinforced layers. They can withstand pressures of up to 800 psi, with a burst pressure of 4000 psi. Accurate and Precise Gauges: This gauge combines a dry and liquid-filled design with a dry dial to improve winter performance. The calibration screws ensure ±1.6% accuracy, and Fahrenheit temperature units make for easy reading. Plus, the sight glass design allows you to see the flowing liquid refrigerant during filling. Sturdy Build for Endurance: This heavy-duty AC gauge set is made of solid brass, aluminum, PVC, and plastic, ensuring strength, longevity, and sealing. The tools have been designed and tested for durability. Excellent Service: We are committed to providing the best professional tools and the best service for auto repair. We provide 24-hour before and after-sales service.