The New York Application for Approval of Backflow Prevention Devices (DOH 347) is a document that must be completed and submitted to the New York State Department of Health (NYS DOH) for approval of a backflow prevention device. This document is used to demonstrate that the device meets the requirements of the New York State Sanitary Code and the Public Health Law. The application consists of four different types of forms, each with their own purpose: 1. Design Evaluation Form (DOH-347A): This form is used to provide the NYS DOH with information on the design and construction of the backflow prevention device. 2. Test Report Form (DOH-347B): This form is used to provide the NYS DOH with information on the performance testing of the device. 3. Installation Certification Form (DOH-347C): This form is used to provide the NYS DOH with information on the installation of the device. 4. Maintenance and Repair Certification Form (DOH-347D): This form is used to provide the NYS DOH with information on the maintenance and repair of the device. All of these forms must be completed and submitted to the NYS DOH for approval of the backflow prevention device.