A hex key, also known as an Allen wrench, is a small handheld tool with a hexagonal cross-section used to drive screws and bolts with hexagonal sockets. In plumbing, hex keys are often used for tasks like tightening or loosening set screws on faucets, adjusting valves, or securing components in fixtures and fittings. Hex keys come in various sizes, typically measured in millimeters or inches, and are made from materials like steel or alloy for durability. They are available in L-shaped or T-handle designs, offering leverage for turning screws in tight spaces. Proper use of hex keys ensures secure and leak-proof connections in plumbing installations, making them an essential tool for both professional plumbers and DIY enthusiasts.
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