I understand that based on most Plumbing Code requirements that black steel pipe is not permitted on the upstream side of a backflow preventer. If pipe is provided between a flange and the backflow, it should be galvanized.
Do fittings, such as an elbow off the flange, need to also be galvanized?
I'm familiar with the Victaulic orange painted cast-iron grooved fittings (Firelock series) as well as ductile iron flanged fittings that seem to be commonly off of a stub-in flange, but I'm wondering if these need anything special like a painted or galvanized finish?
Thanks in advance - really appreciate the community and expertise here.
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PE PREP SERIES