Description
The Caleffi 573403A is a FlowShield DuC-AV dual check backflow preventer with atmospheric vent and a 1/2 in NPT connection, listed to ASSE 1012 for intermediate-hazard protection of potable water lines.
Product data compiled from Caleffi North America technical documentation. Last reviewed July 2026.
FunctionDual Check + Atmos. Vent
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