I've said here before that I basically use three spray guns. I have a cheap Harbor Freight gun with a 20oz metal cup, a DeVilbiss Finishline gun with a plastic, 4oz cup and the new SATA Mini-Jet gun with a 4oz metal cup.
Well, I usually use the DeVilbiss gun to shoot color. I had just shot some color and was cleaning up and went to take the plastic cup off and the thing split right where the threads go into the gun. OK, stuff happens and I figured I'd see if I could get a metal cup for it to sort of avoid this problem in the future. I found one (or thought I had). Not real cheap, but not horrible and I ordered it from some outfit that sells it through eBay motors. The cup arrived today and I took it out of the box and low and behold, it doesn't fit. Right layout, but it has course threads and the gun has fine threads. I look on the box and the cup is for a Binks gun. My fault, I suppose. I had foolishly assumed that there would be something resembling standardization with these things. Guess not. I'm waiting to hear back from the outfit to see if they even carry the correct cup. Not sure if they sent the wrong one or I chose the wrong one.
Guess we'll see. The descriptions on these sites aren't the best and it seemed to say it would fit my gun.
Sigh ...