I need to install some shut-off valves in four inbound copper pipes from the main feeder pipe to the bathroom, and to connect deck-mounted tub filler and valves to the inbound copper pipe. Because of the location and the tight space, I thought of using PEX - specifically Zurn PEX.

I've heard of an issue with PEX in general and an issue with Zurn PEX...

First, one fellow told me that I had to be a licensed plumber to install PEX in this area (East King County). Is this true?

Second, I've read about a class action suit against ZURN because it's brass fittings are failing. Is this true? Would ZURN's brass fittings be a problem in the this area?

Thanks for any feedback.