The Watts 709DCDA-DOSY-GPM 4 is a 4" double check detector assembly (DCDA), approved for low health hazard protection. It features a cast iron body and a rubber seat. Rated to 175 psi and 33°F to 110°F.
This 4 inch double check detector backflow preventer assembly is designed to prevent the reverse flow of fire protection substances and water of non-potable quality from being pumped or siphoned into the potable water supply due to backsiphonage and or backpressure. It is ideal for protection at cross-connections identified as non-health hazards such as on fire protection systems and from other contaminants found at the service line entrance. It consists of a fused epoxy coated cast iron body, domestic outside stem and yoke resilient seated gate valves, captured spring check valves, a gallons per minute metered bypass to detect underground leaks and unauthorized water use, and four test cocks. The coating on this backflow assembly uses ArmorTek®, a patented 3-part advanced epoxy coating system designed to limit both microbial induced (MIC) and exposed metal substrate corrosion.
Features
- Utilizes advanced ArmorTek coating technology to resist corrosion of internals
- Cast iron body construction with patented 3-part advanced epoxy coating system designed to limit both microbial induced (MIC) and exposed metal substrate corrosion
- Gallons per minute meter
- Silicon rubber check discs
- Outside stem and yoke shutoffs
- Includes: Test Cocks
- Includes: Bypass
Common Questions
- What hazard level is this DCDA approved for?
- It is rated for low health hazard (non-toxic, "pollutant") cross-connections only. Where the substance downstream could be a health hazard, codes require a reduced pressure zone (RPZ) assembly instead. The assembly is listed to ASSE 1048.
- Can this be installed on potable water?
- No. This model is not certified lead-free, so it may not be installed in potable water systems in states enforcing the NSF/ANSI 372 weighted-average lead rule. Use it on non-potable service — fire lines, irrigation or industrial water — or order the LF (lead-free) version of this model for drinking-water use.
- Does this assembly have to be tested every year?
- Yes. This is a field-testable assembly. Most water authorities require it to be tested and certified by a licensed backflow tester at installation and annually thereafter. It carries USC FCCCHR approval, which many jurisdictions accept as their sole approval list.
- What shutoff valves are included?
- It is supplied with outside screw and yoke (OS&Y) gate valves on the inlet and outlet. OS&Y gates give the visible open/shut indication that fire-line and many water-authority specs require.
- Is this suitable for a fire sprinkler line?
- Yes. Detector assemblies are built for fire sprinkler service: the metered bypass registers the low flows that reveal a leak or an unauthorized tap on the fire line. This model is UL Classified and FM Approved. The bypass meter reads in GPM.
Specifications
-
Type: Double Check
-
Size: 4"
-
Inlet Size: 4"
-
Outlet Size: 4"
-
Body Material: Cast Iron
-
Seat / Seal Material: Rubber
-
Max Pressure (psi): 175
-
Application: Fire Protection
-
Backflow Protection: Both
-
Operation: Continuous
-
Country of Origin: United States
-
Warranty: 1 Year Limited
-
MPN: 709DCDA-DOSY-GPM 4
-
Temperature: 33°F to 110°F
-
Certifications: ASSE-1048, UL, FM, USC
-
Lead-Free: No
-
Assembly Type: DCDA
-
Hazard Protection Level: Low Health Hazard
-
ASSE Standard: ASSE 1048
-
USC FCCCHR Approved: Yes
-
Fire Protection Listing: UL Classified;FM Approved
-
Field Testable: Yes
-
Shutoff Valves: OSY Gate
-
Flood Sensor (SentryPlus Alert): No
-
Strainer Included: No
-
Air Gap Fitting Included: No
-
Bypass Meter: GPM
