The backflow preventer installation is done using brass fittings that are strong and do not corrode.
The backflow preventer is sensitive to freezing and protected by an insulation pouch.
A hollow rock cover is used to protect the backflow preventer installation from the elements.
Galvanized pipe begins to rust on day 1 of the backflow installation. Rusty pipes leak.
The backflow preventer is sensitive to cold temperatures and without insulation, it will freeze and crack.
The weight of snow on the unprotected backflow installation damaged it beyond repair. Brass fittings were not used here.
Quality goes without say here.