To replace a faucet supply line, you are looking for a supply line with a 1/2 inch connector on one side and you need to know what size compression connector you need on the other side. When you remove the old supply line, measure the male thread on the valve. If the outside diameter is roughly 1/2 inch, it is 3/8 compression. If it's roughly 5/8 of an inch, it's 1/2 inch compression.
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