The answer to 'how much is supply line' is that the cost of a plumbing supply line can vary significantly depending on several factors. Supply lines are the flexible tubes that connect your faucets, toilets, and other plumbing fixtures to the main water supply. The price can range from $5 to $50 or more, depending on the material, length, and any special features.
The most common materials for supply lines are braided stainless steel, which is durable and corrosion-resistant, and flexible plastic or rubber, which are more affordable. Longer supply lines, usually 12-24 inches, will cost more than shorter 6-inch versions. Specialty supply lines with built-in shutoff valves or other features can also increase the price. To get an accurate cost, it's best to get quotes from local plumbers or home improvement stores in your area.