Watts 9D-M3 1/2″ Female NPT Dual Check Backflow Preventer
Watts 9D-M3 1/2″ Female NPT Dual Check Backflow Preventer with Intermediate Atmospheric Vent prevent the reverse flow of hot or cold polluted water from entering into the potable water supply.
- Primary check valve has rubber disc seating against a mating rubber part to ensure tight closing
- Stainless steel internal parts for longevity
- Can be installed vertically or horizontally
- Line-sized construction enables check modules to open further, helping to reduce check fouling