Skip to Main Content
Skip to Search
Skip to Search
Our Company
Customer Support
Investors
Careers
MEA
Products
Products
Plumbing & Flow Control Solutions
Plumbing & Flow Control Solutions
Automatic Control Valves
Automatic Control Valves
Backflow Preventers
Backflow Preventers
Check Valves
Check Valves
Float Valves
Float Valves
High Purity Piping & Laboratory Accessories (Orion)
High Purity Piping & Laboratory Accessories (Orion)
Hydronic & Steam Heating
Hydronic & Steam Heating
Mixing Valves
Mixing Valves
Pressure Reducing Valves
Pressure Reducing Valves
Relief Valves
Relief Valves
Shutoff Valves
Shutoff Valves
SOCLA Valves
SOCLA Valves
All Plumbing & Flow Control
All Plumbing & Flow Control
Water Quality Solutions
Water Quality Solutions
Conditioning Solutions
Conditioning Solutions
Disinfection Solutions
Disinfection Solutions
Filtration Solutions
Filtration Solutions
Instrumentation Solutions
Instrumentation Solutions
OneFlow Scale Prevention Solutions
OneFlow Scale Prevention Solutions
Water Quality Parts & Accessories
Water Quality Parts & Accessories
All Water Quality
All Water Quality
Drainage Solutions
Drainage Solutions
Chemical Waste Pipes & Fittings (Orion)
Chemical Waste Pipes & Fittings (Orion)
Cleanouts
Cleanouts
Dead Level Trench Drains
Dead Level Trench Drains
Floor Drains
Floor Drains
Interceptors
Interceptors
Neutralization Tanks & System Monitoring (Orion)
Neutralization Tanks & System Monitoring (Orion)
Parking Deck Drains
Parking Deck Drains
Roof Drains
Roof Drains
Sanitary Floor Sinks
Sanitary Floor Sinks
All Drainage
All Drainage
HVAC & Hot Water Solutions
HVAC & Hot Water Solutions
Air Conditioning Valves
Air Conditioning Valves
Balancing Valves
Balancing Valves
Boilers
Boilers
Control Valves
Control Valves
Floor Heating - Hydronic
Floor Heating - Hydronic
Heating Valves & Accessories
Heating Valves & Accessories
Water Heaters
Water Heaters
All HVAC & Hot Water
All HVAC & Hot Water
Solutions
Solutions
Solutions by Need
Solutions by Need
Smart & Connected
Smart & Connected
Safety & Regulation
Safety & Regulation
Energy Efficiency
Energy Efficiency
Water Conservation
Water Conservation
Systems
Systems
Fire Protection
Fire Protection
Irrigation
Irrigation
Radiant Heating Systems
Radiant Heating Systems
Healthcare Solutions
Healthcare Solutions
Hospitality Solutions
Hospitality Solutions
Legionella Solutions
Legionella Solutions
Resources
Resources
Planning
Planning
Installation
Installation
Operation
Operation
Repair/Replace
Repair/Replace
Resource Library
Resource Library
Specification Sheets
Specification Sheets
Installation Manuals
Installation Manuals
Videos
Videos
Case Studies
Case Studies
Catalogs
Catalogs
FAQs
Backflow Hub
Backflow Hub
Specification & Design
Specification & Design
SpecHUB
SpecHUB
ASSE Lookup
ASSE Lookup
BIM & CAD Drawings
BIM & CAD Drawings
Product MasterSpec
Product MasterSpec
Tools
Tools
Valves Selection Tool
Valves Selection Tool
Drains Selection Tool
Drains Selection Tool
Digital Mixing Savings Calculator
Digital Mixing Savings Calculator
Product Calculators
product-calculators
Product Cross-reference
Product Cross-reference
Selexit Online Configurator
Selexit Online Configurator
Education & Training
Education & Training
Continuing Education (CEU)
Continuing Education (CEU)
Our Brands
Our Brands
Watts
Watts
Mueller Steam Specialty
Mueller Steam Specialty
Orion
Orion
Powers
Powers
SOCLA
SOCLA
HF scientific
HF scientific
AERCO
AERCO
PVI Industries
PVI Industries
The Detection Group
The Detection Group
News & Events
News & Events
All Brands and Popular Watts Solutions
All Brands and Popular Watts Solutions
How to Buy
How to Buy
How Can We Help You?
How Can We Help You?
Looking for the nearest location to purchase Watts products and accessories?
Looking for the nearest location to purchase Watts products and accessories?
Locate a Distributor or Wholesaler
Locate a Distributor or Wholesaler
Contact Customer Support
Contact Customer Support
Search Watts
Search Watts
Products
Plumbing & Flow Control Solutions
Backflow Preventers
Double Check Valve Assemblies
LF850 Large
LF850-DOSY DC 4
Find a Sales Representative
Find a Wholesaler/Distributor
Customer Support
Share this Product