Backwater Valve - M3 Global Flood Technologies Ltd
MULTI Anti-backflow valve
Backflow preventer (moderate risk) - Lajoie inc. Distribution-Conseil.
Dispositifs anti-refoulement
Outlet Flap Valve, Anti Flood Non-Return Valve – Freeflush Water Management Ltd.
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