Skip to Main Content
Skip to Search
Skip to Search
Customer Support
Investors
Careers
Canada
French
English
Products
Products
Plumbing & Flow Control Solutions
Plumbing & Flow Control Solutions
Automatic Control Valves
Automatic Control Valves
Backflow Preventers
Backflow Preventers
Hydronic & Steam Heating
Hydronic & Steam Heating
Mixing Valves
Mixing Valves
PEX Plumbing & Radiant Heating Systems
PEX Plumbing & Radiant Heating Systems
Pressure Reducing Valves
Pressure Reducing Valves
Relief Valves
Relief Valves
Shutoff Valves
Shutoff Valves
All Plumbing & Flow Control
All Plumbing & Flow Control
Water Quality & Rainwater Harvesting Solutions
Water Quality & Rainwater Harvesting Solutions
Conditioning Solutions
Conditioning Solutions
Disinfection Solutions
Disinfection Solutions
Filtration Solutions
Filtration Solutions
OneFlow Scale Prevention Solutions
OneFlow Scale Prevention Solutions
Rainwater Harvesting
Rainwater Harvesting
Water Quality Parts & Accessories
Water Quality Parts & Accessories
All Water Quality
All Water Quality
Drainage Solutions
Drainage Solutions
Chemical Waste Pipes and Fittings
Chemical Waste Drainage and Vents
Drainage Tanks and Monitoring
Drainage Tanks and System Monitoring
Fixture Carriers
Fixture Carriers
Floor Drains & Channels (Trench)
Floor Drains & Channels (Trench)
Interceptors
Interceptors
Roof Drains
Roof Drains
All Drainage
All Drainage
HVAC & Hot Water Solutions
HVAC & Hot Water Solutions
Floor Heating
Floor Heating
Heating Valves & Accessories
Heating Valves & Accessories
Snow Melting
Snow Melting
All HVAC & Hot Water
All HVAC & Hot Water
Product Directory
Product Directory
Solutions
Solutions
Solutions by Need
Solutions by Need
Safety & Regulation
Safety & Regulation
Energy Efficiency
Energy Efficiency
Water Conservation
Water Conservation
Comfort
Comfort
Channel Solutions
Channel Solutions
Wholesale
Wholesale
OEM
OEM
Retail
Retail
Systems
Systems
Drainage
Drainage
Fire Protection
Fire Protection
Gas Safety
Gas Safety
Irrigation
Irrigation
Radiant Heating Systems
Radiant Heating Systems
Rainwater Harvesting
Rainwater Harvesting
Snow Melting
Snow Melting
Ballast Water
Ballast Water
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
Price Lists
Price Lists
FAQs
FAQs
Specification and Design
Specification and Design
SpecHUB
SpecHUB
ASSE Lookup
ASSE Lookup
BIM & CAD Drawings
BIM & CAD Drawings
MasterSpec Downloads
MasterSpec Downloads
Tools
Tools
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
Instructor-led Training
Instructor-led Training
Watts Works Online Training
Watts Works Online Training
Expand Your Knowledge
Expand Your Knowledge
Our Brands
Our Brands
Our Company
Our Company
History
History
Diversity & Inclusion
Diversity & Inclusion
Community
Community
Sustainability
Sustainability
Company Logos
Company Logos
150th Celebration
150th Celebration
News & Events
News & Events
Our Brands
Our Brands
Watts
Watts
AERCO
AERCO
Ames Fire & Waterworks
Ames Fire & Waterworks
Apex
Apex
BLÜCHER
BLÜCHER
Bradley
Bradley
Dormont
Dormont
FEBCO
FEBCO
HF scientific
HF scientific
Orion
Orion
POWERS
POWERS
PVI Industries
PVI Industries
Leak Defense
Leak Defense
Lync
Lync
SunTouch
SunTouch
Syncta
Syncta
tekmar Control Systems
tekmar Control Systems
The Detection Group
The Detection Group
All Brands and Popular Watts Solutions
All Brands and Popular Watts Solutions
How to Buy
How to Buy
Looking for help with product questions, support or a quote?
Looking for help with product questions, support or a quote?
Find a Sales Representative
Find a Sales Representative
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
Search Watts
Search Watts
Products
Plumbing & Flow Control Solutions
Backflow Preventers
Reduced Pressure Zone Assemblies
M400
M400N-OSY 3
Find a Sales Representative
Find a Wholesaler/Distributor
Customer Support
Share this Product