AC Refrigerant R410a Manifold Gauge Set 2 Valve w/ 3 Hoses Large 2 3/4" Diameter Easy-to-read, Dual Gauges. Manifold with Built-in Sight Glass High Pressure or Low Pressure is Selectable. Diaphragm Valves with Swivel Seals for More Positive Seal and Less Wear Pressure in PSI. Temperature in _F for R410a,R22,R404a. Extra Large Easy to Read Color Coded Dials Rubber gauge covers for added protection. Durable Metal Casing Aluminum Alloy Testing Manifold Body. High Impact Pop-in Lexan Lens