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LF860 Large

Lead Free* MasterSeries In-Line Reduced Pressure Zone Assembly Backflow Preventers with Flood Sensor - Large Diameter

Product Image - LF860 Large
Product Image - LF860 Large
Lead Free MasterSeries In-Line Reduced Pressure Zone Assembly Backflow Preventer, OSY Gates and Flood Sensor
Lead Free MasterSeries In-Line Reduced Pressure Zone Assembly Backflow Preventer, OSY Gates and Flood Sensor
Adding activation kit to flood sensor
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LF860 Large

Lead Free* MasterSeries In-Line Reduced Pressure Zone Assembly Backflow Preventers with Flood Sensor - Large Diameter

Features

  • Sensor on the relief valve for flood detection
  • Flood alert feature activated with add-on connection kit, compatible with BMS and cellular communication
  • ArmorTek coating technology to resist corrosion of internals
  • Combines the use of a stainless-steel relief valve seat and stainless-steel check components for maximum performance and durability
  • Requires no special tools for inline service
  • Is highly suitable for potable drinking water systems where code mandates protection from backpressure and backsiphonage conditions
  • Protects potable water against cross-connection contamination of high hazard (toxic) fluids in water services
  • Sizes 2 1/2 to 10 Inch
  • Integrates with the Sensor Control Monitor to deliver maintenance alerts to BAS via RS-485 Modbus or the Nexa platform by Wi-Fi connectivity
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“nexaplatform

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

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MasterSeries LF860 Large 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

The valve’s internals are protected by ArmorTek®, a multilayer corrosion‑resistant coating engineered to extend service life in demanding environments.

To learn more visit: https://www.watts.com/armortek

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

Video - ArmorTek Advanced Coating System Overview

Armortek’s patented triple-layer coating protects valves from corrosion and microbiologically induced damage, extending their lifespan and enabling repair and recycling for sustainable water management.

Runtime : 00:01:13Watch Now

Video - MasterSeries LF860 Maintenance and Repair

Runtime : Watch Now

Select a Model

Select options below to identify the UPC, Order Code, and Repair Kit for a specific LF860 Large

Model
Description
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Model Used On - Series or Model Kit Contents
Product Image - RK-LF8X6/8X6V
8X6/8X6V-SM 21/2-3

Check Spring Kit

</br>856ST, 876VST, LF860, LF886V</br>

</br>
850/860 Product Image
FRK 850/860-C-T 2 1/2-3

Cover Kit

</br>850, 860</br>

Epoxy Coated Cover, Expansion Pin, O-ring, Bearing Socket</br>
860/880V Product Image
FRK 860/880V-VT 2 1/2-10 INT ASSY

Relief Valve Internal Module Kit

</br>860 Large, 880V</br>

Module Assembly, Outer Diaphragm</br>
860/880V Product Image
FRK 860/880V-VT 2 1/2-10 TOTAL

Relief Valve Kit

</br>860, 880V</br>

Seat Ring, 2 O-rings, Outer/Inner Diaphragm, Sensing Line Gasket, Retainer, Main Guide, Flow Screw, Slip Ring, Seat Disc, Aux Guide, Flow Washer, Stem and Spring</br>
860-RT Product Image
FRK 860-RT 2 1/2-3

Complete Rubber Parts Kit

</br>860</br>

6 O-rings, 2 Jam Nuts, 2 Washers, Outer/ Inner Diaphragm, RV Seat Disc, 2 Check Discs, 2 Seat Ring Gaskets, Sensing Line Gasket, 4 Bulk Head Gaskets, 2 Bearing Sockets, RV Extension</br>
860 Product Image
FRK 860-VT

Relief Valve Kit

</br>860</br>

Main Assembly with Internals, Seat Ring, Elbow, 3 O-rings, Sensing Line Gasket, Extension, 8 Bolts, 8 Nuts, 4 Washers</br>
870/876V-RT Product Image
FRK 870/876V-RT 2 1/2-3

Complete Rubber Parts Kit

</br>870, 876V</br>

2 Seat Discs, 2 Seat Gaskets, 2 Cover O-rings, 2 Cover Bushings, Cover Plate Gasket and O-ring, 4 Bulk Head Gaskets</br>
880V Product Image
FRK 880V

Relief Valve Rubber Parts Kit

</br>860 Large, 880V</br>

2 O-rings, Outer/Inner Diaphragm, Seat Disc, Sensing Line Gasket</br>
Product Image - RK-850/856/870v/876/LF850/LF870V
LFFRK 85X/87X-RT 2 1/2-3

Complete Rubber Parts Kit

</br>856ST, 876VST, LF860, LF886V</br>

</br>
Product Image - LFFRK 850-870-CK4 21-2-3
LFFRK 850/870-CK4 856/876 CK1 860/880 CK2 2 1/2-3

Check Replacement Kit-Inlet

</br>850, 870</br>

</br>
Product Image - LFFRK 850-880-SM2 21-2-3
LFFRK 850-880-SM2 DCDA 2 1/2-3

Check Spring Kit

</br>850, 880</br>

</br>
Product Image - RK-850/856/860/856/870V/876V/LF850/LF886V/860
LFFRK 850-886V-D 2 1/2-3

Disc Kit

</br>850, 856ST, 886V</br>

</br>
Product Image - RK-850/870V;RK-LF850-LF886V
LFFRK 850-886V-S 2 1/2-3

Seat Ring/Arm Kit

</br>856ST, 876VST, LF860, LF886</br>

</br>
Product Image - RK-LF860/LF880
LFFRK 860/880-CK1 2 1/2-3

First Check Kit

</br>LF860, LF880</br>

</br>
Product Image - LFFRK 860-80V-RVS21-2-10
LFFRK 860-80V-RVS

Relief Valve Seat Kit

</br>LF860, LF866, LF880V, LF886V</br>

Relief Valve Seat, O-ring</br>
Product Image - LFFRK 860-80V-RVS21-2-10
LFFRK 860-80V-RVS 2 1/2-10

Relief Valve Seat Kit

</br>LF860, LF866, LF880V, LF886V</br>

Relief Valve Seat, Relief Valve Seat O-ring</br>
Product Image - LFFRK 860-80V-SM1 21-2-3
LFFRK 860-80V-SM1 21/2-3

Check Spring Kit

</br>LF860, LF880</br>

</br>
Product Image - RK-LF860/LF880V
LFFRK 860-80V-VT 2 1/2-10

Total Relief Valve Kit

</br>LF860, LF866, LF880V, LF886V</br>

</br>
Product Image - LFFRK 860-80V-VT 21/2-10
LFFRK 860-80V-VT 2 1/2-10 RV

Relief Valve Internal Module Kit

</br>LF860, LF866, LF880V, LF886V</br>

</br>
Product Image - RK-LF860/LF880V
LFFRK 86X/88X-RT 2 1/2-3

Complete Rubber Parts Kit

</br>LF860, LF866</br>

</br>
SCM_BF_1000000788_nexa badge
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>
BMS Sensor Connection Kit, For Series LF860-FS Large, LF866-FS, LF880V-FS, LF886V-FS, Sizes 2 1/2 to 10 IN
FP-FBF-BMS 2 1/2-10

Activation Kit

</br>LF860 Large, LF866, LF880V, LF886V</br>

Sensor Activation Module with Cable, Ground Wire, Power Adapter</br>
Cellular Sensor Connection Kit, For Series LF860-FS Large, LF866-FS, LF880V-FS, LF886V-FS, Sizes 2 1/2 to 10 IN
FP-FBF-CFS 2 1/2-10

Activation Kit

</br>LF860 Large, LF866, LF880V, LF886V</br>

Sensor Activation Module with Cable, Cellular Gateway with Mounting Kit, Ground Wire, Power Adapter</br>
Product Image - Stand alone flood Sensors for 860, 866, 880
FP-FBF-SA-FMS-2 1/2-10

Upgrade/Repair Kit

</br>860 Large, 866, 880V</br>

Flood Sensors, Nuts, Bolts</br>
Product Image - FRK 860-880-RT 8-10
FRK 860/880-RT 8-10

Complete Rubber Parts Kit

</br>860, 880</br>

2 Seat Discs, 2 Seat Gaskets, 2 Cover O-rings, 2 Cover Bushings, Cover Plate Gasket and O-ring, 4 Bulk Head Gaskets, Relief Valve Rubber Components</br>
Product Image - RK-850/856/870v/876/LF850/LF870V
FRK850-56/870-76-RT 8-10

Complete Rubber Parts Kit

</br>850, 856</br>

2 Seat Discs, 2 Seat Gaskets, 2 Cover O-rings, 2 Cover Bushings, Cover Plate Gasket and O-ring, 4 Bulk Head Gaskets</br>
Product Image - RK-850/856/870v/876/LF850/LF870V
LFFRK 85X/87X-RT 8-10

Complete Rubber Parts Kit

</br>856ST, 876VST, LF860, LF886V</br>

</br>
Product Image - LFFRK 850-860V-D 8-100
LFFRK 850-866V-D 8-10 870-886 8

Disc Kit

</br>850, 856ST, 886V</br>

</br>
Product Image - LFFRK-850-880-SM2-8-10
LFFRK 850-880-SM2 DCDA 8-10

Check Spring Kit

</br>850, 880</br>

</br>
Product Image - RK-850/870V;RK-LF850-LF886V
LFFRK 850-886V-S 8-10

Seat Ring/Arm Kit

</br>856ST, 876VST, LF860, LF886</br>

</br>
Product Image - RK-LF850/LF870
LFFRK 850-CK4 8-10 870 CK4 8

Check Kit

</br>856ST, 876VST, LF860, LF880V</br>

</br>
Product Image - RK-LF860/LF880
LFFRK 860/880V-RT 8-10

Complete Rubber Parts Kit

</br>LF860, LF880V</br>

</br>
Product Image - RK-LF860/LF880V
LFFRK 860-80V-RV 2 1/2-10

Relief Valve Rubber Parts Kit

</br>LF860, LF880V</br>

</br>
Product Image - LFFRK 860-80V-SM1 8-10
LFFRK 860-80V-SM1 RP/RPDA 8-10

Check Spring Kit

</br>LF860, LF880</br>

</br>
Product Image - RK-LF860/LF880
LFFRK 860-CK1 8-10 880 CK1 8

First Check Kit

</br>860</br>

</br>
Product Image - RK-LF880/LF860V
LFFRK 880X-VT ALL/86X 10

Relief Valve Kit

</br>LF880V, LF886V, LF860, LF866 </br>

</br>
850/860,71AH-N Product Image
FRK 850/860-C-T 4

Cover Kit

</br>850, 856, 860, 870, 880</br>

Cover, Expansion Pin, Socket Bearing, O-ring</br>
Product Image - RK-850/856/870v/876/LF850/LF870V
LFFRK 85X/87X-RT 4

Complete Rubber Parts Kit

</br>856ST, 876VST, LF860, LF886V</br>

</br>
Product Image - LFFRK 850/870-CK4 856/876 CK1 860/880 CK2 4
LFFRK 850/870-CK4 856/876 CK1 860/880 CK2 4

Check Replacement Kit-Inlet

</br>850, 870</br>

</br>
Product Image - RK-LF850-LF880
LFFRK 850-880-SM2 DCDA 4

Check Spring Kit

</br>850, 880</br>

</br>
Product Image - RK-LF850-LF886V
LFFRK 850-886V-D 4

Disc Kit

</br>850, 856ST, 886V</br>

</br>
Product Image - RK-850/870V;RK-LF850-LF886V
LFFRK 850-886V-S 4

Seat Ring/Arm Kit

</br>856ST, 876VST, LF860, LF886</br>

</br>
Product Image - RK-LF860/LF880
LFFRK 860/880-CK1 4

First Check Kit

</br>LF860, LF880</br>

</br>
Product Image - RK-LF860/LF880V
LFFRK 860-80V-SM1 RP/RPDA 4

Check Spring Kit

</br>LF860, LF880</br>

</br>
Product Image - LFFRK 86X-88X-RT 4
LFFRK 86X/88X-RT 4

Complete Rubber Parts Kit

</br>LF860, LF866</br>

O-rings, Gaskets, Diaphragms, Seat Disc, Screws, Washers</br>
Product Image - RK-850/856/870v/876/LF850/LF870V
FRK 850/856/870/876-RT 6

Complete Rubber Parts Kit

</br>850, 856, 870, 876</br>

2 Seat Discs, 2 Seat Gaskets, 2 Cover O-rings, 2 Cover Bushings, Cover Plate Gasket and O-ring, 4 Bulk Head Gaskets</br>
Product Image - RK-850/856/860/856/870V/876V/LF850/LF886V/860
FRK 850/856/870V/876V-D 6

Disc Kit

</br>850, 856, 807V, 876V</br>

Seat Disc Assembly, Cover O-ring, Nut, Washer, Lube</br>
850/860,71AH-N Product Image
FRK 850/860-C-T 6

Cover Kit

</br>850, 860</br>

Cover, Expansion Pin, Socket Bearing, O-ring</br>
860-RT Product Image
FRK 860-RT 6

Complete Rubber Parts Kit

</br>860</br>

6 O-rings, 2 Jam Nuts, 2 Washers, Outer/ Inner Diaphragm, RV Seat Disc, 2 Check Discs, 2 Seat Ring Gaskets, Sensing Line Gasket, 4 Bulk Head Gaskets, 2 Bearing Sockets, RV Extension</br>
860/880-D,880/880V Product Image
FRK 880/880V-D 6

Disc Kit

</br>880, 880V</br>

Seat Disc Assembly, Cover O-ring, Nut, Washer, Lube</br>
Product Image - RK-850/856/870v/876/LF850/LF870V
LFFRK 85X/87X-RT 6

Complete Rubber Parts Kit

</br>856ST, 876VST, LF860, LF886V</br>

</br>
Product Image - LFFRK 850-880-SM2 6
LFFRK 850-880-SM2 DCDA 6

Check Spring Kit

</br>850, 880</br>

</br>
Product Image - RK-850/856/860/856/870V/876V/LF850/LF886V/860
LFFRK 850-886V-D 6

Disc Kit

</br>850, 856ST, 886V</br>

</br>
Product Image - RK-850/870V;RK-LF850-LF886V
LFFRK 850-886V-S 6

Seat Ring/Arm Kit

</br>856ST, 876VST, LF860, LF886</br>

</br>
Product Image - LFFRK 860-VT 2 1/2-8
LFFRK 860-VT 2 1/2-8

Relief Valve Kit

</br>860</br>

</br>
Product Image - RK-850/856/860/856/870V/876V/LF850/LF886V/860
FRK 850/856/870V/876V-D 8-10

Disc Kit

</br>850, 856, 807V, 876V</br>

10 IN Seat Disc Assembly, Cover O-ring, Nut, Washer, Lube</br>
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