I have a situation (water filter mounting) where a couple of
3/4" x 3" NPT pipe nipples would work perfectly, but got a shock when I saw the price on those in brass ($15 each at Lowes). So I decided to ues PVC nipples, but then noticed on the tag, "For outdoor use only". Of course, no explanation why.In scrambling to find other options, I noticed some very nicely molded white PVC fittings, but they didn't have the "For outdoor use only" tags. But no nipples.
I've noticed that the gray nipples have a decidedly different feel than the white fittings.
On some of the white fittings, made by Dura, I see (in some embossed printing) "PVC-1". I don't notice that in the gray PVC nipples.
I've searched a lot on the web, but can't find an explanation as to the difference between white and gray PVC, nor why the gray is for outdoor use only, nor whether either are ok for drinking water applications. Even the Dura website was silent on this.
Anyone?