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Internet #304958128

Model #1-350FT

Store SO SKU #1003115685

1 in. Double Check Backflow Preventer

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Product Overview

The 1 in. 350FT Double Check Valve Assembly with integral male 45° flare SAE test fitting is used in low health hazard, non-potable water applications for protection against both backsiphonage and backpressure of polluted water. A favorite for irrigation contractors, the patented and innovative EZSwap removable pressure vessel allows for simple, cost-effective maintenance and repairs, straightforward line flushing, quick winterization, and water savings. Its stainless steel shut-off valve handles, hardware, and struts are corrosion-resistant and the durable UV resistant reinforced nylon EZSwap Pressure Vessel resists corrosion and mineral build-up to better withstand harsh outdoor conditions.
  • Flush Tool (FLUSH) provides easy line flushing, saving up to 15 minutes per installation
  • EZSwap removable pressure vessel reduces repair time and costs, and is serviceable off-line
  • Design ensures water savings
  • Stainless steel and durable, UV-resistant reinforced nylon construction offers corrosion-resistance and quick winterization
  • Reduced labor and repair kit costs save 75% or more during backflow lifecycle
  • ASSE Listed 1015
  • IAPMO Listed
  • CSA Certified B64.5
  • AWWA Compliant C510
  • Approved by the Foundation for Cross Connection Control and Hydraulic Research at the University of Southern California
  • California residents

Info & Guides

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1 in. Double Check Backflow Preventer



Inlet Diameter (In.)
Outlet Diameter (In.)
Product Depth (in.)
4.5 in
Product Height (in.)
5.5 in
Product Length (in.)
11.6 in
Product Width (in.)
4.5 in


Potable Water
Compatible Pipe Material
Female Pipe Thread
Lead Free
Maximum Pressure (psi)
Maximum Working Temperature (F)
Pack Size
Product Weight (lb.)
10 lb
Valve Type
Air Admittance

Warranty / Certifications

Manufacturer Warranty

Questions & Answers

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Customer Reviews

  • 4
    out of 3 reviews
  • 100% recommend this product
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Showing 1-3 of 3 reviews
Leaks on second season
Purchased 2 of these over past 4 years and both have developed leaks. First one leaked in main housing second one leaking in ball valve housing. Backflow is indoors so weather is not a factor in failure
by RP67
    • Recommended Product
    1 person found this helpful
    5 Star Review
    Rating provided by a verified purchaser
    by HomeDepotCustomer
    • Verified Purchase
    I was very pleased with my order through Home Depot. Hassle free and received the item in just a ...
    I was very pleased with my order through Home Depot. Hassle free and received the item in just a few days after ordering. I am very pleased with the back flow after I installed it. I would definitely recommend this product to anyone for their irrigation system.
    by Budrow
    • Verified Purchase
    • Recommended Product
    Showing 1-3 of 3 reviews