I guess I am either extremely hard on fittings or they are just crap these days. I keep having issues with them blowing apart or they start leaking internally followed by chewing up the male fittings on my tools. About half the time, when I separate the fittings they hang open and I have to beat them on the floor to get them to shut off the air flow. I don’t know if they are made for low pressure or what. I even bought them in sets, thinking maybe I had a mismatch on the style. No bueno. Here’s a prime example. Notice all of the pieces scattered about. These fittings are about 3 months old.