Service and diagnose vehicle A/C systems with Nilight A/C manifold gauge sets. Designed for automotive HVAC testing, refrigerant charging and pressure diagnostics, these 3-way and 4-way manifold gauge kits support common refrigerants such as R134a, R410A, R22, R404A, R12 and R502, with durable gauges, 5FT hoses, adjustable or quick couplers and universal can tap options for cars, trucks, SUVs and other compatible A/C systems.