I had someone at Home Depot look at my air compressor, and they said it is leaking and to replace the pressure regulator. I found the part on this site.

How does one replace this pressure reducer on the Husky 2G110BP? It looks like there's no room to untwist the old pressure regulator from the tank, especially with the side hose on one side and the gauge on the other side. Also what tools would you use?