Milton Industries 1115 NPT Regulator Review

So far so good, I bought this regulator to replace the old one on my compressor. The controller seems to be of good quality and works perfectly.

I bought the Milton regulator because it was supposed to be a quality American product. I filled it with copper (photo). When I first pressurized the system to 90psi from the remote compressor, everything worked fine. When I finally ran the factory compressor and got to 140psi, it started leaking until the pressure dropped below 100psi. This regulator is designed for an operating pressure of 250 psi. So there is no excuse. I don't know what kind of guarantee, but I'd like a free kit. I think…