Step 6 · Install the New Angle Stop
Take your new angle stop; it should come with a new compression nut and ferrule. First, slide the new compression nut onto the clean copper pipe, making sure the threads face outwards, towards you. Next, slide the new brass ferrule onto the pipe with its tapered end facing the end of the pipe (towards where the valve will go). Now, push the body of the new angle stop firmly onto the end of the pipe until it seats snugly against the ferrule. The pipe should go about 1/2 to 3/4 inch into the valve body.