Review on 🔧 Copper Swaging Punch for Efficient Pipe Expansion by Cody Siger

This will expand the copper tube to fit over another piece. Save the sleeve. Takes some practice, but works great. The challenge is to hold the tube in place without damaging it. I used a piece of wood with a rod slightly smaller than the pipe and a vise. This actually works with any softer pipe material. I've had success using a heat gun on a plastic tube.