Well I finally bought the Milwaukee CO2 regulator! When I first attached it to the CO2 bottle, I also got CO2 shooting out and that dreaded squeal. I tried to hook it up twice and then walked away. I decided to tear it down and start again. I was using the fiber washer given to me by the compressed gas dealer. I then tried the plastic washer that came with the regulator... no problem. Everything fell right into place when I used a plastic washer. Just my experience.