LF919
Lead Free* Reduced Pressure Zone Assembly Backflow Preventers with Flood Sensor, Sizes 1/2 to 2 IN
LF919
Lead Free* Reduced Pressure Zone Assembly Backflow Preventers with Flood Sensor, Sizes 1/2 to 2 IN
Features
- Sensor on the relief valve for flood detection
- Lead Free* cast copper silicon alloy body construction, two poppet-style check valves, replaceable check seats, and an intermediate relief valve
- Maximum working pressure: 175 psi (12.06 bar)
- Separate access covers for the check valves and relief valve
- Bottom-mounted relief valve for reduced space requirements
- Top-mounted test cocks reduce installation clearances and make testing easier
- Innovative plastic seat guides and check valve plastic cover bushings for trouble-free guiding
- Integrates with the Sensor Control Monitor to deliver maintenance alerts to BAS via RS-485 Modbus or the Nexa platform by W-Fi connectivity
Nexa pairs integrated sensing hardware with free, upgradable software to empower facilities with unprecedented visibility and control over their water systems, helping teams protect assets, deliver consistent performance, and drive measurable ROI.
Learn more about Nexa
Series LF919 Lead Free* Reduced Pressure Zone assemblies feature a flood sensor using SentryPlus Alert® technology to detect continuous discharge from the relief valve. When paired with an add on connection kit, the sensor is activated to relay alerts for potential flooding events. Connection kit options include BMS, cellular communication, and the Sensor Control Monitor which enables integration with BAS via RS-485 Modbus or the Nexa® platform through Wi-Fi.
This series prevents the reverse flow of contaminated water caused by backsiphonage or backpressure from entering the potable water supply. Ideal for protection at health hazard cross-connections or for containment at the service line entrance. Its compact modular design facilitates maintenance and assembly access. Check with local water authorities for installation requirements.
To learn more visit: https://www.watts.com/floodprotectionsystem/
Approval/Certification Information
For product-specific approval information, please refer to the product’s specification sheet (see literature section above) or ask a Watts representative. Some certification agencies allow you to search by product name and brand.
Literature
Video - Connected Backflow Flood Detection
Learn how Watts flood sensors integrated with backflow prevention assemblies provide real-time alerts for excessive relief valve discharge, helping prevent water damage and facility downtime.
Runtime : 00:01:10Watch Now
Select a Model
Select options below to identify the UPC, Order Code, and Repair Kit for a specific LF919
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| Model | Used On - Series or Model | Kit Contents |
|---|---|---|
|
FP-BF-BMS 2 1/2-10
Activation Kit |
</br>009, LF009, 909, LF909, 909RPDA, LF919, 957, 957RPDA, LF957RPDA, 994, 994RPDA, C400, C500, LFC500, 4000SS, 5000SS, Deringer 40/40G, Deringer 40X/40GX, Deringer 50/50G, Deringer 50X/50GX</br> |
Sensor Activation Module with Cable, Ground Wire, Power Adapter</br> |
|
FP-BF-CFS 2 1/2-10
Activation Kit |
</br>009, LF009, 909, LF909, 909RPDA, LF919, 957, 957RPDA, LF957RPDA, 994, 994RPDA, C400, C500, LFC500, 4000SS, 5000SS</br> |
Sensor Activation Module with Cable, Cellular Gateway with Mounting Kit, Ground Wire, Power Adapter</br> |
|
FP-BF-SA-919-1/2-1
Upgrade/Repair Kit |
</br>LF919</br> |
Flood Sensor with 1 Screw</br> |
|
LFRK 919C 1
Cover Kit |
</br>LF919</br> |
Cover, Cover O-ring</br> |
|
LFRK 919-C 3/4-1
Cover Kit |
</br>LF919</br> |
Cover, Cover O-ring</br> |
|
LFRK 919VC 3/4-1
Relief Valve Cover Kit |
</br>LF919</br> |
Relief Valve Cover, Cover O-ring</br> |
|
RK 919-CK1 1
First Check Kit |
</br>LF919, 919</br> |
Check Assembly, Spring, Cover O-ring</br> |
|
RK 919-CK2 1
Second Check Kit |
</br>LF919, 919</br> |
Check Assembly, Spring, Cover O-ring</br> |
|
RK 919-RC4 1
Check Rubber Parts Kit |
</br>919</br> |
Disc, Seat O-ring, Cover O-ring</br> |
|
RK 919-RT 1
Complete Rubber Parts Kit |
</br>LF919, 919</br> |
2 Check Seat O-rings, 2 Check Cover O-rings, Relief Valve O-ring, Relief Valve Cover O-ring, Relief Valve Stem O-ring, Check Rubber, Relief Valve Diaphragm, Quad Ring, Relief Valve Disc</br> |
|
RK 919-RV 3/4-1
Relief Valve Rubber Parts Kit |
</br>919</br> |
Relief Valve Disc, RV Diaphragm, RV Seat O-ring, Cover O-ring</br> |
|
RK 919-S 1
Seat Kit |
</br>919</br> |
Disc, Seat O-ring, Cover O-ring</br> |
|
RK 919-SV 3/4-1
Relief Valve Seat Kit |
</br>919</br> |
Relief Valve Seat, RV Seat O-ring, RV Cover O-ring</br> |
|
RK 919-T 1
Total Repair Kit |
</br>919</br> |
Relief Valve Repair Kit, First Check Repair Kit, Second Check Repair Kit</br> |
|
RK 919-VT 3/4-1
Total Relief Valve Kit |
</br>LF919, 919</br> |
Relief Valve Assembly, RV Spring, RV Cover O-ring</br> |
|
SCM-BF-CONN KIT
Activation Kit |
</br>Watts 009/LF009, LF909, LF919, 909RPDA, 957, 957RPDA, 994, 994RPDA; Ames C400, C500, 5000SS, 4000SS, FEBCO LF860, 825Y, LF825Y, LF866, LF880V, LF886V</br> |
Sensor Control Monitor, Power Adapter, Mounting Feet, and Quick Start Guide</br> |
|
FP-BF-SA-919-1 1/4-2
Upgrade/Repair Kit |
</br>LF919</br> |
Flood Sensor with 1 Screw</br> |
|
LFRK 919C 1 1/4-1 1/2
Cover Kit |
</br>LF919</br> |
Cover, Cover O-ring</br> |
|
LFRK 919VC 1 1/4-2
Relief Valve Cover Kit |
</br>LF919</br> |
Relief Valve Cover, Cover O-ring</br> |
|
RK 919-CK1 1 1/4-1 1/2
First Check Kit |
</br>919</br> |
Check Assembly, Spring, Cover O-ring</br> |
|
RK 919-CK2 1 1/4-1 1/2
Second Check Kit |
</br>919</br> |
Check Assembly, Spring, Cover O-ring</br> |
|
RK 919-RC4 1 1/4-1 1/2
Check Rubber Parts Kit |
</br>919</br> |
Disc, Seat O-ring, Cover O-ring</br> |
|
RK 919-RT 1 1/4-1 1/2
Complete Rubber Parts Kit |
</br>LF919, 919</br> |
2 Check Seat O-rings, 2 Check Cover O-rings, Relief Valve O-ring, Relief Valve Cover O-ring, Relief Valve Stem O-ring, Check Rubber, Relief Valve Diaphragm, Quad Ring, Relief Valve Disc</br> |
|
RK 919-RV 1 1/4-2
Relief Valve Rubber Parts Kit |
</br>919</br> |
Relief Valve Disc, RV Diaphragm, RV Seat O-ring, Cover O-ring</br> |
|
RK 919-S 1 1/4-1 1/2
Seat Kit |
</br>919</br> |
Disc, Seat O-ring, Cover O-ring</br> |
|
RK 919-SV 1 1/4-2
Relief Valve Seat Kit |
</br>919</br> |
Relief Valve Seat, RV Seat O-ring, RV Cover O-ring</br> |
|
RK 919-T 1 1/4-1 1/2
Total Repair Kit |
</br>919</br> |
Relief Valve Repair Kit, First Check Repair Kit, Second Check Repair Kit</br> |
|
RK 919-VT 1 1/4-2
Total Relief Valve Kit |
</br>919</br> |
Relief Valve Assembly, RV Spring, RV Cover O-ring</br> |
|
LFRK 919C 1/4-1/2
Cover Kit |
</br>LF919</br> |
Cover, Cover O-ring</br> |
|
LFRK 919-VC 1/4-1/2
Relief Valve Cover Kit |
</br>LF919</br> |
Relief Valve Cover, Cover O-ring</br> |
|
RK 919-CK1 1/4-1/2
First Check Kit |
</br>LF919, 919</br> |
Check Assembly, Spring, Cover O-ring</br> |
|
RK 919-CK2 1/4-1/2
Second Check Kit |
</br>LF919, 919</br> |
Check Assembly, Spring, Cover O-ring</br> |
|
RK 919-RC4 1/4-1/2
Check Rubber Parts Kit |
</br>919</br> |
Disc, Seat O-ring, Cover O-ring</br> |
|
RK 919-RT 1/4-1/2
Complete Rubber Parts Kit |
</br>LF919, 919</br> |
2 Check Seat O-rings, 2 Check Cover O-rings, Relief Valve O-ring, Relief Valve Cover O-ring, Relief Valve Stem O-ring, Check Rubber, Relief Valve Diaphragm, Quad Ring, Relief Valve Disc</br> |
|
RK 919-RV 1/4-1/2
Relief Valve Rubber Parts Kit |
</br>LF919, 919</br> |
Relief Valve Disc, RV Diaphragm, RV Seat O-ring, Cover O-ring</br> |
|
RK 919-S 1/4-1/2
Seat Kit |
</br>919</br> |
Disc, Seat O-ring, Cover O-ring</br> |
|
RK 919-SV 1/4-1/2
Relief Valve Seat Kit |
</br>919</br> |
Relief Valve Seat, RV Seat O-ring, RV Cover O-ring</br> |
|
RK 919-T 1/4-1/2
Total Repair Kit |
</br>919</br> |
Relief Valve Repair Kit, First Check Repair Kit, Second Check Repair Kit</br> |
|
RK 919-VT 1/4-1/2
Total Relief Valve Kit |
</br>LF919, 919</br> |
Relief Valve Assembly, RV Spring, RV Cover O-ring</br> |
|
LFRK 919C 2
Cover Kit |
</br>LF919</br> |
Cover, Cover O-ring</br> |
|
RK 919-CK1 2
First Check Kit |
</br>LF919, 919</br> |
Check Assembly, Spring, Cover O-ring</br> |
|
RK 919-CK2 2
Second Check Kit |
</br>919</br> |
Check Assembly, Spring, Cover O-ring</br> |
|
RK 919-RC4 2
Check Rubber Parts Kit |
</br>919</br> |
Disc, Seat O-ring, Cover O-ring</br> |
|
RK 919-RT 2
Complete Rubber Parts Kit |
</br>LF919, 919</br> |
2 Check Seat O-rings, 2 Check Cover O-rings, Relief Valve O-ring, Relief Valve Cover O-ring, Relief Valve Stem O-ring, Check Rubber, Relief Valve Diaphragm, Quad Ring, Relief Valve Disc</br> |
|
RK 919-S 2
Seat Kit |
</br>919</br> |
Disc, Seat O-ring, Cover O-ring</br> |
|
RK 919-T 2
Total Repair Kit |
</br>919</br> |
Relief Valve Repair Kit, First Check Repair Kit, Second Check Repair Kit</br> |
|
RK 919-CK1 3/4
First Check Kit |
</br>919</br> |
Check Assembly, Spring, Cover O-ring</br> |
|
RK 919-CK2 3/4
Second Check Kit |
</br>919</br> |
Check Assembly, Spring, Cover O-ring</br> |
|
RK 919-RC4 3/4
Check Rubber Parts Kit |
</br>919</br> |
Disc, Seat O-ring, Cover O-ring</br> |
|
RK 919-RT 3/4
Complete Rubber Parts Kit |
</br>LF919, 919</br> |
2 Check Seat O-rings, 2 Check Cover O-rings, Relief Valve O-ring, Relief Valve Cover O-ring, Relief Valve Stem O-ring, Check Rubber, Relief Valve Diaphragm, Quad Ring, Relief Valve Disc</br> |
|
RK 919-S 3/4
Seat Kit |
</br>919</br> |
Disc, Seat O-ring, Cover O-ring</br> |
|
RK 919-T 3/4
Total Repair Kit |
</br>919</br> |
Relief Valve Repair Kit, First Check Repair Kit, Second Check Repair Kit</br> |
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