Water Pressure Regulator. Brass Lead-free Adjustable Water Pressure Reducer for Rv with Guage. Includes Inlet Screened Filter. Model A01-1117tm This should be the first thing connecting to the campsite's city water connector 2017 New and improved version, with Glycerin inside the guage with a bubble for better shock absorbing. By putting this regulator first, you protect your filter and hose as well. Brass. Lead Free. Adjustable. Factory preset at 45 PSIAdjustable to 160 PSI Adjust pressure, ONLY with all water turned off inside the RV.