Attached to sill cocks, valves, and hydrants with Male hose thread outlet. For indoor or outdoor use. Designed to prevent dangerous back siphonage and back flow into a potable water supply. Furnished with break-a-way lock screw if vandal-resistant installation is desired. For nonfreezing areas only....

With fine machine threads for attachment to wall hydrant. Nickel plated-for use on 485BFP & 486BFP frost proof wall hydrants The VPC PK1390 is a replacement self-draining vacuum breaker for frost free hydrants with FINE THREADS (will not connect to hose threaded faucet). A must on all outdoor system...

LASCO 05-1771 Self Draining Vacuum Breaker with Fine Thread, for Arrowhead 490BPF and 480 Series Hydrants.  Arrowheads "Freeze-Tector" represents a revolutionary breakthrough by allowing freeze protection combined with health protection from possible contaminated water sources caused by back-siphona...