The answer to 'what is supply line' is a supply line, also known as a water supply line, is a pipe that carries fresh water from the main water line or water meter to an individual plumbing fixture or appliance in a home. Supply lines are typically made of flexible copper, braided stainless steel, or plastic tubing, and connect the fixture or appliance to the home's water distribution system.
Supply lines are an essential component of a home's plumbing system, as they ensure a reliable and consistent flow of water to sinks, toilets, washing machines, dishwashers, and other water-using devices. They are designed to withstand water pressure and resist leaks, and they come in a variety of sizes to accommodate different fixture and appliance requirements.