Tested (1) backflow preventer. Building does have a total of (3) backflow, we are only hired to test domestic. Location: sprinkler room front left of building outside. Use: domestic water Type: DC Make: watts Model: LF007M1QT Size: 2 inch S/N: 096229 Water pressure: 95psi 1st check: 2.0 2nd check: 1.6 Passed. Accidentally tested the fire sprinkler backflow. This backflow did not pass inspection. The 2nd check failed and the pressure fell below the minimum required of 1.0 psid. Make: Ames Model: Deringer 30X Size: 6 inch Type: DCDA The backflow will need rebuilt. Minimum of 2nd check replaced but highly recommend doing both the 1st and 2nd checks at the same time. Spoke to Felicia about fire sprinkler backflow.