Review on 💨 Flexzion Deluxe Adjustable AC R134a Quick Coupler Connector Set: High-Quality Manifold Gauge Low & High Side Adapter for Auto Air Conditioning - Essential HVAC Replacement Tool by Warrick Dembo

I hooked up these couplers to my gauges and pressurized the system to see if they held pressure and then vented the pressure if the valves are opened. The product passes the first test. They still have to suck and charge the system, although I'm sure they will work well from the first test. Good deal for the price.