Review on GooMeng 3PCS Color Coded R12 R22 R134A R410 Refrigerant Ball Valve for AC HVAC Refrigeration Charging Hoses - Air Conditioning Refrigerant Enhancer by Ryan Brady

Ball valves provide a good shut off mechanism for the YJ gauge I bought. Ball valves are smooth. The threads are fine, not rough, not leaking, which is my biggest concern before placing an order. Red, blue, yellow plastic sleeves are very loose. They come off too easily. Too bad they didn't use those shrink wraps instead. But compared to other brands, they are reasonably priced and do the job.