Our Refrigeration Manifold Gauge Suited for R12/R22/R502/R134a/R404a/R407C/R410a. Forged brass body valve with dual o-ring pistons. Optical sight glass aids refrigerant inspection. Two compound pressure gauge colored scales are easy to read. Color-coded valve handles are easy operation,even to oily fingers. Protective boots resisit to shock,vibration and pulsation. Usually include 3-pcs colorcoded standard charging hose. Every manifold gauge is individually tested for reliability before packing.