Step 8 · Tighten Connections
Using the same two-wrench technique as before, tighten all connections. Use one wrench to hold the body of the new angle stop steady, preventing it from turning. Use the second wrench to tighten the compression nut onto the valve. After hand-tight, give it one-half to one full turn with the wrench. Do not overtighten, as this can damage the ferrule or the valve. Next, reconnect the faucet supply line to the outlet of the new valve. Hand-tighten the coupling nut, then give it a gentle quarter-turn with a wrench.