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A **3-in-1 oxygen cylinder key** is a versatile tool designed to handle multiple functions related to an oxygen cylinder, streamlining the process of setting up and operating the equipment. Made of durable materials like stainless steel or brass, this key combines three essential tools into one compact device, making it a staple in medical and industrial settings.### Three Key FunctionsThe key's unique design allows it to perform the following three tasks:1. **Opening and Closing the Cylinder Valve:** The primary function is to open and close the main valve on the oxygen cylinder. It features a square or T-shaped head that fits onto the valve stem, allowing a user to easily turn the valve to start or stop the flow of gas.2. **Fitting a Regulator:** A second function is to act as a spanner to tighten the nut that secures a regulator to the cylinder. This ensures a leak-proof connection, which is crucial for safety and accurate oxygen delivery.3. **Opening a Flowmeter Valve:** The key can also be used to adjust or open the valve on a flowmeter. This allows for precise control over the oxygen flow rate, which is essential for delivering the correct amount of oxygen to a patient or for a specific industrial application.By combining these functions, a 3-in-1 key eliminates the need for multiple tools and simplifies the process of managing an oxygen cylinder, improving efficiency and safety.