This is great quality, made in the USA by Parker for Robinair. Robinair is a manufacturer of a full line of HVAC service equipment and stands by its products. They are made of solid metal, either chrome steel or chrome-plated brass, and the workmanship is good. They have handles on top for manually turning the Schrader valve on and off, allowing you to attach or detach the Schrader fitting with the valve closed without accidentally losing refrigerant or accidentally causing frostbite on theβ¦