A. Any Backflow Prevention Device required by these Rules and Regulations, shall be of a model or construction approved by the Water Purveyor and shall comply with the following:
1. An Air Gap Separation, to be approved, shall be at least twice the diameter of the supply pipe as measured vertically above the top rim of the vessel; but shall in no case be less than one (1) inch;
2. Any Double Check Valve Assembly or Reduced Pressure Principal Backflow Prevention Device required by this regulation shall be approved by the Water Purveyor and appear on the most recent list of Approved Backflow Prevention Devices published by the OEPA;
3. An Interchangeable Connection, to be approved, shall be either a swing type connector or a four-way valve of the lubricated plug type that operates through a mechanism which unseats the plug, turns it ninety degrees, and reseats the plug. Four-way valves shall not be used as stop valves but must have separate stop valves on each pipe connected to the four-way valve, and shall have no piping connected. The threads or flange on this port shall be destroyed so that a connection cannot be made.
4. All Backflow Prevention Devices shall include properly located test cocks and manufacturer approved tightly closing shut-off valves.
5. The requirements of OAC 3745-95-06(A).
B. Existing Backflow Prevention Devices, approved by the Director or the Director of the OEPA at the time of installation and properly maintained, shall, except for inspection, testing and maintenance requirements, be excluded from the requirement of section (A) above, providing the Water Purveyor is assured that they will satisfactorily protect the public potable water system. Whenever the existing device is moved from the present location or requires more than minimum maintenance, or when the Water Purveyor finds that the maintenance of the device constitutes a hazard to health, the device shall be replaced by a Backflow Prevention Device meeting the requirements of these Rules and Regulations.