I ran some galvanized fitting when I did mine only because I didnt feel like waiting a week for black ones to come in. What I have heard is that the galvanized coating can flake off and then go into your tools = very bad. I dont worry too much about it because I have a filter that has the same quick connects so I usually move it to whatever port I am running my air tools off of. If I am just using a blow gun I dont worry about it at all.