Caleffi 573403A 573 Series Dual Check Backflow Preventer with Atmospheric Vent 1/2" NPT, ASSE 1012

The Caleffi 573403A is a 1/2" NPT dual check backflow preventer with intermediate atmospheric vent, listed to ASSE 1012. It keeps water from a heating or process system from flowing back into the potable water supply.

ASSE 1012 devices are commonly installed on the cold water make-up line to hydronic boilers and other low-hazard equipment connections. Two independent check valves and a vent chamber between them discharge water to atmosphere if backpressure or back-siphonage occurs.

Before ordering, confirm your 1/2" NPT line size and that local code accepts an ASSE 1012 device for the application; high-hazard connections typically require a reduced pressure zone (ASSE 1013) assembly. Allow for drainage from the vent port.

Specifications

• Brand: Caleffi
• Manufacturer Part #: 573403A
• Series: 573
• Type: Dual Check Backflow Preventer with Atmospheric Vent
• Size: 1/2"
• Connection: 1/2" NPT threaded
• Max Temperature: 210F
• Max Pressure: 175 psi
• Material: Brass
• Standards: ASSE 1012
• UPC: 8016615087604
• Category: Backflow Preventers

Documents

• Technical Data Sheet (PDF)
• Installation & Operation Manual (PDF)

See also: backflow preventers, all Caleffi products.