2.5 C400Z-OSY-FS
Item Number: F0191282
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$6,312.32
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Brand - Ames
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- Assembly Size: 2 1/2 inch
- Weight: 225.0 lb
- Lead Free*: Yes
- Installation Pattern: Z-Pattern Horizontal
- Maximum Working Pressure: 175 psi
- Housing Material: Type 304 Stainless Steel
- Includes SentryPlus Alert Flood Sensor
- OSY Resilient Seated Gate Valves
- Compact design, 70% lighter than traditional models
Description
Description
The Colt 2 1/2 inch C400Z-OSY-FS reduced pressure zone backflow preventer protects potable water systems from contamination due to backsiphonage and backpressure. Featuring a compact, lead-free Type 304 stainless steel body and Z-pattern horizontal installation, it is 70% lighter than conventional designs. This assembly includes OSY resilient seated gate valves and an integrated SentryPlus Alert flood sensor for detecting relief valve discharges. When paired with an optional connection kit, the sensor relays alerts for potential flooding. It operates within a 33°F to 140°F temperature range and has a maximum working pressure of 175 psi. Item F0191282.
Help Me Connect
Help Me Connect
Installation Orientation
- Approved for Z-pattern horizontal installation, ensuring proper alignment with the direction of flow.
Connections
- Features grooved inlet and outlet gate connections for straightforward installation and pipeline adjustment.
- Requires an add-on sensor connection kit for activating flood sensor alerts; kit options include BMS, cellular, or Sensor Control Monitor for integration with BAS/Nexa via RS-485 Modbus or Wi-Fi.

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Additional Details
This Colt 2 1/2 inch lead free reduced pressure zone backflow preventer assembly is designed to prevent the reverse flow of fire protection substances and non-potable water into the potable water supply.
It offers protection against backsiphonage and backpressure in continuous pressure piping applications and cross-connections identified as health hazards.
Features
- SentryPlus Alert flood sensor for continuous discharge detection from the relief valve.
- Includes an integrated supervisory switch as an option on each gate valve for OSY models.
- Extremely compact design and 70% lighter than traditional models.
- Type 304 (Schedule 40) stainless steel housing and sleeve.
- Groove fittings for integral pipeline adjustment and ease of installation.
- Patented link check for lowest pressure loss and unmatched ease of serviceability.
- Replaceable check disc rubber.
- Approved for Z-pattern horizontal installation.
- Drip tight shutoff valves.
Flood Sensor & Alerts
- Flood alert feature activated with an add-on sensor connection kit.
- When paired with a connection kit, the sensor relays alerts for potential flooding via BMS, cellular communication, or integration with BAS/Nexa platform through Wi-Fi.
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
- Product Type: Reduced Pressure Zone Backflow Preventer
- Assembly Size: 2 1/2 inch
- Model: C400Z-OSY-FS
- Installation Pattern: Z-Pattern Horizontal
- Shutoff Valves: OSY Resilient Seated Gate Valves
- Lead Free*: Yes (wetted surface less than 0.25% of lead by weight)
Performance
- Temperature Range: 33°F - 140°F (0.5°C - 60°C)
- Maximum Working Pressure: 175 psi (12.1 bar)
Materials
- Housing & Sleeve: Type 304 (Schedule 40) stainless steel
- Elastomers: EPDM, silicone, Buna 'N'
- Link Checks: Noryl®, stainless steel
- Check Discs: Reversible silicone or EPDM
- Test Cocks: Lead Free* bronze body
- Pins & Fasteners: 300 Series stainless steel
- Springs: Stainless steel
Dimensions (for 2 1/2 inch OSY)
- A Dimension: 30 3/4 inch (781 mm)
- C (OSY) Dimension: 16 3/8 inch (416 mm)
- D Dimension: 9 3/8 inch (238 mm)
- G Dimension: 29 1/16 inch (738 mm)
- H Dimension: 21 1/2 inch (546 mm)
- J Dimension: 15 1/2 inch (393 mm)
- M Dimension: 8 13/16 inch (223 mm)
- P Dimension: 21 1/4 inch (540 mm)
- Weight (OSY): 128 lb (58 kg)
Certificates & Approvals
- 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 Classified
- FM Approved
- NSF Certified to NSF/ANSI 61-G
FAQs
What is the primary purpose of this backflow preventer?
The Colt C400Z-OSY-FS backflow preventer is designed to prevent the reverse flow of non-potable water and fire protection substances into the potable water supply, protecting against contamination from backsiphonage and backpressure.
What does "Lead Free*" mean for this product?
"Lead Free*" signifies that the wetted surface of this product, which comes into contact with consumable water, contains less than 0.25% of lead by weight, complying with lead-free installation requirements.
How does the SentryPlus Alert flood sensor work?
The integrated SentryPlus Alert flood sensor detects excessive water discharges from the relief valve. When an add-on connection kit is used, the sensor activates to relay multichannel alerts (call, email, text) to notify personnel of potential flooding.
What are the connection types for this backflow preventer?
This 2 1/2 inch C400Z-OSY-FS model features grooved inlet gate connections and grooved outlet gate connections, designed for easy installation and integral pipeline adjustment.
What is the maximum operating pressure and temperature range for this assembly?
This backflow preventer has a maximum working pressure of 175 psi (12.1 bar) and can operate within a temperature range of 33°F to 140°F (0.5°C to 60°C).