Fixed my busted copper pipe under my concrete slab by running pex. I ran the pex inside my existing copper pipe to my outside access. I then used sharkbite connectors to join the pex to existing pipes. I had estiments that started at 4000.00 to 8000.00 to dig up my floor and run new pex. My cost of running pex inside my copper pipe was only 50.00. Simple DIY fix that saved me lots of money.