Tested one backflow preventer. Location: fire Sprinkler room Use: Domestic water Type: RP Make: Watts Model: 957 Serial Number: YE-0878 Size: 3 inch 1st check: 9.0 2nd check: 6.0 Relief: 3.5 Water Pressure: 80 psi Pass While on-site, water pressure was originally over 100 psi. I adjusted the pressure reducing valve to 80 psi.