1. HVAC Manifold Gauge sets 2. For refrigerant R12, R134a,R502,R407c REFRIGERANT ... Features:1.100% virgin PTFE diaphragms2. Full porting for maximum refrigerant flow3. All Industrial grade replaceable brass ... One full turn open/close valve6. Oversized sightgalss for easy viewing7. Excellent vacuum characteristics8. No-flutter gauge ... &blue 36"(90cm) Refrigerant Gauge Manifold Sets for R134a,R12,R22,R502