10 C300N-OSY-GPM
Item Number: 0191253Brand - Ames
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- Size: 10 inch
- Weight: 1106.0 lb
- Housing Material: 304 (Schedule 40) Stainless Steel
- Maximum Working Pressure: 175 psi
- Check Valve Type: Patented Tri-Link Check
- Shutoff Valves: OS&Y Resilient Seated Gate Valves
- Bypass Assembly: Gallon per minute meter included
- Installation: Horizontal, Vertical, N-Pattern
- Certifications: UL Classified, FM Approved, AWWA C510-97
Description
Description
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Connections
- This 10 inch C300N Double Check Detector Assembly features groove end connections for integral pipeline adjustment.
- The OS&Y gate valves are designed for secure integration into fire sprinkler systems and other non-potable service lines.
- The assembly supports horizontal, vertical, or N pattern installations, providing flexibility for various plumbing layouts.

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Additional Details
This Colt Series C300N 10 inch Double Check Detector Backflow Preventer Assembly is designed to protect drinking water supplies from dangerous cross-connections, particularly in non-health hazard applications such as fire line sprinkler systems, irrigation, and industrial processing.
It monitors for unauthorized water use and prevents reverse flow due to backsiphonage or backpressure.
Construction & Features
- Features an extremely compact design and is 70% lighter than traditional models, allowing for smaller vaults and enclosures.
- The housing and sleeve are constructed from 304 (Schedule 40) stainless steel for long-term corrosion protection and maximum strength.
- Equipped with Patented Tri-Link Check modules which provide the lowest pressure loss and unmatched ease of serviceability.
- Groove fittings allow for integral pipeline adjustment.
- Includes OS&Y (Outside Stem and Yoke) resilient seated gate valves and four test cocks.
- Furnished with a gallon per minute meter in the bypass assembly to detect underground leaks and unauthorized water use.
- Can be installed in horizontal, vertical, or N pattern installations.
- Optional integrated supervisory switch on each gate valve of the OS&Y model (UL Certified, Safety Signaling, Control No. 3L38).
- Check discs feature replaceable check disc rubber for easy maintenance.
WARNING: It is illegal to use this product in any plumbing system providing water for human consumption, such as drinking or dishwashing, in the United States. Before installing standard material product, consult your local water authority, building and plumbing codes.
Specifications
General
- Product Type: Double Check Detector Backflow Preventer Assembly
- Series: C300N
- Size: 10 inch
- Brand: Colt (Ames Fire & Waterworks)
- Model: OS&Y (Outside Stem and Yoke) Shutoffs
- Installation Pattern: N-Pattern, Horizontal, or Vertical
Materials
- Housing & Sleeve Material: 304 (Schedule 40) Stainless Steel
- Elastomers: EPDM, Silicone, Buna 'N'
- Tri-Link Checks Material: Noryl®, Stainless Steel
- Check Discs: Reversible Silicone or EPDM
- Test Cocks: Lead Free* Bronze Body
- Pins & Fasteners: 300 Series Stainless Steel
- Springs: Stainless Steel
Performance
- Maximum Working Pressure: 175 psi (12.1 bar)
- Temperature Range: 33°F – 140°F (0.5°C – 60°C)
- Pressure Loss: Lowest pressure loss (Patented Tri-Link Check)
Certificates & Approvals
- UL Classified
- FM Approved
- Approved by the Foundation for Cross-Connection Control and Hydraulic Research at The University of Southern California (USC)
- AWWA C510-97
- CSA B64.5 (for OS&Y models)
- Supervisory Switch: UL Certified, Safety Signaling, Control No. 3L38 (for integrated supervisory switch option)