Tested all (3) backflow preventers. And rebuild one of the 3. IRRIGATION 1-1/2 inch Wilkins 975XL RP Serial number ACK2036 1st check 9.0 2nd check 8.0 Relief 3.0 Water pressure 62 psi Passed Domestic water 2 inch Wilkins 950XL DC serial number 2576282 1st check 2.0 2nd check 2.0 62 psi water pressure Passed Fire sprinkler Rebuilt backflow with new 1st and 2nd checks. Tested and passed Fire sprinkler 4 inch Ames 2000SS DC Serial number 154370 1st check 4.0 2nd check 3.5 80 psi water pressure Passed