The answer to 'how does supply line work' is that a supply line is a pipe or tubing that connects a water source, such as a main water line, to a plumbing fixture or appliance. Supply lines are responsible for delivering water to sinks, toilets, washing machines, and other household water-using devices. They are typically made of materials like copper, PEX (cross-linked polyethylene), or CPVC (chlorinated polyvinyl chloride), and are designed to withstand the pressure and flow of water moving through them.
Supply lines are an essential component of a home's plumbing system, as they ensure a reliable and consistent water supply to all the fixtures and appliances that require it. They are usually installed during the initial construction of a home, but may also need to be replaced or repaired over time due to wear, damage, or leaks.