... 2. For refrigerant R12, R134a,R502,R407c REFRIGERANT GAUGE MANIFOLD SET WHOLESLE!Key Features:1.100% virgin PTFE diaphragms2. ... . Oversized sightgalss for easy viewing7. Excellent vacuum characteristics8. No-flutter gauge design9. Easy-to-grip knobsTechnical Paramter:1.Model:QX-BZ134a2 ... /4"-1/4" 3pcs red&yellow&blue 36"(90cm) Refrigerant Gauge Manifold Sets for R134a,R12,R22,R502