So plumbing in my new air compressor I need a compression 90 because there is no way I was going to sweat a fitting on inside of a corner wall. Just isn't going to work snaking in between two 2x8s with 1.5" gap, no room to even get the torch in place. Anyway I called to order that along with some other things I needed and I asked the woman taking the order "I need brass compression elbow for 3/4" copper, which is a 7/8" OD." She has says no problem. Order placed. I get the invoice and it says "three-quarter inch compression fitting" I called back to verify this as I knew really need a 7/8" compression fitting to fit the 3/4" inch copper. Guy on the other and says "Yep that's just how the system lists it".
Guess what shows up?