Details
Model 34HF, 37HF and 50HF Vacuum Breakers
The Woodford NIDEL® Model 34HF and 37HF anti-siphon vacuum breaker is designed to
protect hose connections from contamination where temperatures do not go below freezing. Uses
include laundry tubs, utility sinks, boiler room hose bibbs and outside hose bibbs in non-freezing areas.
Available Finishes: Chrome Plated and Brass
Single-Check ASSE 1011:
34HA standard on Model 25 and 65
34HF standard on Model 24, 43, 44, 45, 46, 74, 75 and 84
Double-Check ASSE 1052:
37HA standard on Model 67*
37HF standard on Model 76, 79 and 86
* Converts Model 65 to Model 67
Woodford Model 50 Auto-Drain Double Check Backflow Preventer
The first ASSE 1052 Approved automatic draining double-check backflow preventer. When a hose is
removed from a Model 50 equipped wall faucet or yard hydrant, two linked but independent checks
move as one to open a path through the valve allowing water to drain completely and prevent freezing.
