SUNGATOR Anti Siphon Valve, 6-Pack Hose Bib Vacuum Breakers Set, 3/4 Inch Backflow Preventer for Garden Spigot, RV, Solid Brass Anti-Backflow Valve with Sealing Tape - Amazon.com
Watts 3/4 In Lead Free Anti-Siphon Pressure Vacuum Breaker Backflow Preventer with Quarter Turn Shutoff And Tee Handles 3/4 LF800M4-QT - The Home Depot
Watts 3/4 In Lead Free Anti-Siphon Pressure Vacuum Breaker Backflow Preventer with Quarter Turn Shutoff And Tee Handles 3/4 LF800M4-QT - The Home Depot