If your Arrowhead Brass 490V faucet is leaking behind the wall, that means the pipe has split. Normally this happens during freezing temperatures due to the water freezing inside the faucet and expanding. Once the water expands eventually it will burst causing water to leak out of the faucet behind the wall.
If you faucet it having this issue, the faucet has to be replaced. In order to replace your faucet we need to know a few things. First, the overall length of your faucet, You can find this by getting the overall length of the stem and adding 4 inches. Second, how the faucet connects. faucet connect in many different ways. By knowing how yours connects we can get you the correct faucet.
See below for help finding the correct stem
See below for the different connection types for this faucet
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