3 C400-NRS-GxG-FS
Item Number: F0112117
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Brand - Ames
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- Nominal Size: 3 inch
- Weight: 224.0 lb
- Type: Reduced Pressure Zone Backflow Preventer
- Shutoff Valves: Non-Rising Stem (NRS) Gate Valves
- Connections: Grooved Inlet x Grooved Outlet
- Housing Material: Type 304 (Schedule 40) Stainless Steel
- Flood Sensor: SentryPlus Alert® Technology
- Lead Free Construction: Yes
- Approvals: ASSE 1013, CSA B64.4, UL, FM, NSF
Description
Description
The Colt 3 inch C400 Reduced Pressure Zone Backflow Preventer Assembly with NRS shutoff valves provides critical protection against backsiphonage and backpressure in potable water systems. This lead-free device is designed for health hazard applications and continuous pressure piping. Featuring a durable Type 304 stainless steel housing, grooved inlet and outlet connections, and an extremely compact, lightweight design for easier installation. An integrated SentryPlus Alert® flood sensor detects excessive relief valve discharge, with active alerts available when paired with an add-on connection kit. Approved for horizontal and N-pattern installations. Item number F0112117.
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Product Connections
- The assembly features grooved inlet and grooved outlet connections.
- Groove couplings are provided for easy installation and pipeline alignment with compatible grooved piping systems.
- This backflow preventer is approved for horizontal installation and can also be configured for N-pattern installation. Ensure installation follows the direction of the flow arrow.
Flood Sensor Connectivity
- The integrated flood sensor requires an add-on connection kit to become active and relay alerts.
- Available connection kit options support integration with Building Management Systems (BMS), cellular networks, or Wi-Fi via the Nexa® platform or RS-485 Modbus.

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Additional Details
This Colt™ 3 inch lead free reduced pressure zone backflow preventer assembly prevents reverse flow of fire protection substances and non-potable water into the potable water supply due to backsiphonage or backpressure. It is ideal for continuous pressure piping applications and health hazard cross-connections, approved for horizontal installation.
Construction & Design
- Features a Type 304 (Schedule 40) stainless steel housing and sleeve with a quick access sleeve
- Designed to be extremely compact and 70% lighter than traditional designs
- Includes torsion spring check modules for unmatched ease of serviceability and lowest pressure loss
- Non-rising stem resilient seated gate valves with grooved inlet and grooved outlet
- Configurable for horizontal or N-pattern installation
- Equipped with test cocks and a bottom mounted pressure relief valve
- Groove couplings for easy installation and pipeline alignment
Flood Detection & Alerts
- Contains a flood sensor with SentryPlus Alert® technology to detect excessive water discharges from the relief valve
- When paired with an add-on sensor connection kit, the sensor activates to relay alerts for potential flooding events
- Connection kit options include BMS, cellular communication, and the Sensor Control Monitor, which integrates with BAS via RS‑485 Modbus or the Nexa® platform through Wi-Fi
NOTICE: An add-on connection kit is required to activate the flood sensor. Without the connection kit, the flood sensor is a passive component and will not communicate with any other device.
Specifications
General
- Product Type: Reduced Pressure Zone Backflow Preventer
- Series: C400
- Nominal Size: 3 inch
- Shutoff Valves: Non-Rising Stem (NRS) Gate Valves
- Connections: Grooved Inlet x Grooved Outlet
- Lead Free: Yes (Wetted surface contains less than 0.25% lead by weight)
- Installation: Horizontal, N-Pattern
Materials
- Housing & Sleeve: Type 304 (Schedule 40) Stainless Steel
- Elastomers: EPDM, Silicone, Buna 'N'
- Check Discs: Reversible Silicone or EPDM
- Test Cocks: Lead Free* Bronze Body
- Pins & Fasteners: 300 Series Stainless Steel
- Springs: Stainless Steel
Flood Detection
- Flood Sensor: SentryPlus Alert® Technology
- Alert Activation: Requires add-on sensor connection kit
- Connectivity Options (with kit): BMS, Cellular, RS-485 Modbus, Wi-Fi (Nexa® platform)
Certificates & Approvals
- Approved by the Foundation for Cross-Connection Control and Hydraulic Research at The University of Southern California (FCCCHR-USC)
- AWWA C511-97
- ASSE 1013
- CSA B64.4
- UL Listed
- FM Approved
- NSF (Certified to NSF/ANSI 61, Annex G)
FAQs
What is the primary function of this backflow preventer?
This Colt 3 inch Reduced Pressure Zone Assembly is designed to protect potable water systems from contamination due to backsiphonage and backpressure, suitable for health hazard applications.
What materials are used in the construction of this backflow preventer?
The housing and sleeve are made from Type 304 (Schedule 40) stainless steel, with lead-free* bronze body test cocks, 300 Series stainless steel pins and fasteners, and stainless steel springs. Elastomers include EPDM, silicone, and Buna 'N'.
How does the integrated flood sensor function?
The SentryPlus Alert® flood sensor detects excessive water discharges from the relief valve. To activate flood alerts and communicate with other devices, an add-on connection kit is required.
What type of connections does this assembly utilize?
This backflow preventer features grooved inlet and grooved outlet connections, designed for easy installation and pipeline alignment with compatible grooved piping systems.
Can this backflow preventer be installed in different configurations?
Yes, it is approved for horizontal installation and can also be configured for N-pattern installation. Always ensure installation adheres to local codes and the direction of the flow arrow.