The Caleffi 304847A is a FlowShield DuC dual check backflow preventer with a 1/2 in PEX crimp union connection, certified to ASSE 1024 for low-hazard residential and commercial potable water protection.
Product data compiled from Caleffi North America technical documentation. Last reviewed July 2026.
Key Features
ASSE 1024 Low-Hazard Protection
Certified to ASSE 1024 and CSA 64.5 for residential and commercial low-hazard backflow protection.
Two Inline Check Valves
Two serviceable check valves close automatically to prevent reverse flow into the potable supply.
Commercial Hot Rated
Complies with NSF/ANSI/CAN 61 for commercial hot water service to 180 °F.
Union End Connections
Union tailpieces simplify installation and in-line service.
Lead-Free / NSF Certified
DZR low-lead brass, certified to NSF/ANSI/CAN 61 and NSF/ANSI/CAN 372 for potable water.
1/2 In Pex Crimp Union Connection
1/2 in PEX crimp union connection.
Technical Data
| Function | Dual check backflow preventer |
|---|---|
| ASSE listing | ASSE 1024 |
| Connection | 1/2 in PEX crimp union |
| Body material | DZR low-lead brass |
| Maximum operating pressure | 175 psi |
| Medium temperature range | 32 - 180 °F |
| Lead-free compliance | NSF/ANSI/CAN 61 and NSF/ANSI/CAN 372 |
Documentation
Technical brochureRelated Products
Frequently Asked Questions
It is a dual check valve backflow preventer for residential and commercial low-hazard potable water lines, preventing reverse flow into the main supply.
ASSE 1024 and CSA 64.5, complying with NSF/ANSI/CAN 61 (180 °F commercial hot) and NSF/ANSI/CAN 372 low-lead.
A dual check (DuC) is for low-hazard applications, while a reduced-pressure (RP) preventer is testable and rated for high-hazard cross-connections.
This model has a 1/2 in PEX crimp union connection.
- Type:
- Dual Check Valve
- Series:
- FlowShield
- ASSE Standard:
- ASSE 1024
- Connection Type:
- Union
- Connection Type:
- PEX Crimp
- Connection Size:
- 1/2 in
