I just went through this and all of the rest of the air system on my coach. Mine is a Travel Supreme Spartan IFS chassis, but any DP on air bags is going to be basically the same. If you can identify the actual part number, you may be able to source the same exact part from a semi tractor trailer parts supplier. I did for my coach and it was half of what a RV parts store wanted. These are used in the trucking industry all over. There are quick response and delayed response valves. My coach, and others I assume, use delayed response valves. There should be an actual spec for ride height for your coach. The old valve may or may not even have your coach at the correct height. You should measure where the manufacturer says to and adjust to that. Need to see if its a Monaco Roadmaster or Freightliner chassis. More than likely the other leveling valves are not far behind. You should also have an air dryer with a filter. Service it. It keeps the air going to these valves and your air brakes clean.