1.Hose bib vacuum breakers are specifically made for portable hoses (ex: garden hose) attached to threaded faucets. Their purpose is to prevent the flow of contaminated water back into the drinking water supply. These devices are not intended for operation under continuous pressure.
2. Backflow prevention assemblies are mechanical devices installed on water services lines (or at plumbing fixtures) to prevent backflow of contaminants into the drinking water supply through cross-connections.