Watts SD-3-FN-LS 1/4 Dual Check Valve Backflow Preventer, Stainless, FNPT

The Watts SD-3-FN-LS 1/4 is a 1/4" dual check valve with FNPT connections, approved for low health hazard protection. It features a stainless body and a rubber seat. Rated to 150 psi.

This 1/4" dual check valve backflow preventer with atmospheric port and strainer for carbonated beverage machines prevents the reverse flow of polluted water, such as carbon dioxide gas and carbonated water, from entering into the potable water supply due to backpressure backflow. It consists of stainless steel body construction with internal rubber components and is designed for continuous or intermittent pressure applications. It has an atmospheric port that provides visual indication of failure of the second check It is ideal for use on post-mix carbonated beverage equipment and dispensing equipment for tea and coffee. End connections are female NPT. Maximum working pressure is 150 psi (10 bar).

Features

• Used for for carbonated beverage machines
• Stainless steel body construction
• Maximum working pressure is 150 psi
• Atmospheric port provides visual indication of failure
• Includes: Strainer

Common Questions

What hazard level is this Dual Check 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 1022.

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.

Can this device be field tested?

No. It has no test cocks and is not a testable assembly, so it cannot be certified by a backflow tester. Where a jurisdiction requires an annually tested device, specify a testable assembly (double check, RPZ, or PVB) instead.

Specifications

• Type: Dual Check
• Size: 1/4"
• Inlet Size: 1/4"
• Outlet Size: 1/4"
• Connection: FNPT
• Body Material: Stainless
• Seat / Seal Material: Rubber
• Max Pressure (psi): 150
• Application: Domestic Water
• Backflow Protection: Backpressure
• Operation: Continuous
• Pack Quantity: 25
• Country of Origin: United States
• Warranty: 1 Year Limited
• MPN: SD-3-FN-LS 1/4
• Certifications: ASSE-1022
• Lead-Free: No
• Assembly Type: Dual Check
• Hazard Protection Level: Low Health Hazard
• ASSE Standard: ASSE 1022
• USC FCCCHR Approved: No
• Field Testable: No
• Number of Test Cocks: 0
• Shutoff Valves: None
• Flood Sensor (SentryPlus Alert): No
• Strainer Included: Yes
• Air Gap Fitting Included: No