I'm looking at buying a house. It has brand-new plumbing throughout, but the pipes are gray. The pipe says "BOW 3/4" (CTS) Superflex 2110 SDR-11 100 PSI". I was scared off when I first saw this, thinking it was the cheap Quest stuff. With further study, I suspect it is Pex, but I've never seen or heard of gray Pex. And I do mean the pipes are gray - they are not white, off white, milky, or any other color like traditional white Pex. These pipes are the same exact color as cheap mobile home Quest. Is this Pex?