I'm about to replace my shower valve and a few other things around the bathroom. I've done a few solder sweating of copper connections in the past, but I am in no way even mediocre at it. While picking up supplies at Homer I noticed a product by Watts Industries called "ez-sweat fittings" that have a ring of solder built into the inside of the fitting, just add flux, heat and yer done. Seems like a good idea for DIY'ers like me. My question is: will this type of copper fitting be as sound and last as long as a traditional copper fitting.