Why did they even bother with the 3 inch? One look at that mess and I would run screaming from the basement. What a hack job hope that guy has a good lawyer. You should contact him at once and demand he installs it per mfg.'s instructions, or you will find another contractor that will and sue him for damages. People like this guy make me sick... And what is up with all that soft copper tubing looks like it is a gas line, might be wrong about that though.