I have the exact same problem, but Im not talking just 2 PVC nipples, I am
developing a leak detection and auto shut off system that will be manufactu
red in volume. Each unit uses 3 schedule 80 PVC nipples and when you build
even 25 units, the cost savings are tremendous over brass or other materia
ls- right now we are planning on production runs of 100, so this cost savin
gs is even more important.
Now, at Home Depot, I can get these 4" PVC Grey nipples that have the tag "
OUTDOOR USE ONLY" for $0.79. I can get the same sch 80 4" nipples from McM
aster-Carr for $1.56. The only difference is McMaster says their piping is
NSF 61 certified for use with drinking (potable) water.
Obviously on my product, I will choose the latter just to be safe since my
product will have drinking water running through it. However, I want to kn
ow why I am paying more...Is the only difference the certification itself,
where McMaster has to up their price to cover extra cost of certifying thei
r products, or is their an actual difference in material or manufacturing p
rocess that makes the Home Depot nipples not safe for potable water applica
tions??? Or is the "OUTDOOR USE ONLY" statement merely there so people don'
t bust a leak inside their homes, and it is OK to run potable water through
these nipples as long as its outside?? You would think that if it was unsa
fe for drinking water, they would have a specific tag just for that. I mea
n people drink outside too right???