Fulton Backflow prevention assemblies ordinance (§ 114-242)

(a) Any backflow prevention assembly protecting the type of facilities listed in section [114-246] and section [114-247] shall be of a model or construction approved by the water purveyor and the state department of natural resources.

(1) Air gap separation to be approved shall be at least twice the diameter of the supply pipe, measured vertically above the top rim of the receiving vessel, but in no case less than one inch.

(2) A double check valve assembly for class II hazards or a reduced pressure principle backflow prevention assembly for class I hazards shall be approved by the water purveyor, and shall appear on the current list of approved backflow prevention assemblies maintained by the state department of natural resources (double check valve assemblies and reduces pressure backflow prevention assemblies approved by the University of Southern California's Foundation for Cross Connection Control and Hydraulic Research).