This is a sources sought announcement for a Backflow Preventer Upgrades project at McConnell AFB, Kansas, involving the removal and installation of five new backflow preventer systems in Buildings 33, 44, 48, and 65. The contractor must handle removal, proper sizing, connections, installation, and testing/certification of systems ranging from 1-inch to 6-inch diameters for fire suppression, boiler makeup, and domestic water. All testing and certification must meet requirements set by the board of appeals of plumbers and gas fitters of Wichita & Sedwick County. No budget amount or submission timeline is specified in this notice. The small business size standard is $19 million under NAICS 238220, and the project may be advertised as unrestricted if adequate small business competition is unavailable.