Step 7 · Install the New Angle Stop
Take the new angle stop and disassemble it. First, slide the new compression nut onto the copper pipe, making sure the threads face towards the end of the pipe. Next, slide the new compression ring (ferrule) on, with its tapered end pointing towards where the valve will be. Push the body of the new angle stop firmly onto the pipe until it stops. Slide the nut and ferrule up to the valve body and hand-tighten the nut. Now, use the two-wrench technique again: one wrench to hold the valve body steady (pointing in its final desired orientation) and the second wrench to tighten the compression nut. Tighten the nut about one-half to three-quarters of a turn past hand-tight. Do not over-tighten.