Backwater & Terminal Backwater Valves

Municipal
Gravity Sewer Systems

Westlake Pipe & Fittings’ Backwater & Terminal Backwater Valves ensure one-way flow in storm and sanitary sewer lines where backflow could be a problem.

  • Available in both in-line and terminal styles
  • Each PVC valve is equipped with a free-hinged flapper that allows unrestricted flow
  • Access lid can be easily removed for inspection and cleaning
  • Both the flapper and access lid have leak-free neoprene gaskets
View Parts and Accessories Catalog
Contact Us
Backwater and Terminal Backwater Valves

Resources

View All Product Resources

Brochure

View product information, real world applications, and more.

Backwater Valves and Terminal Backwater Valves Brochure
Municipal
Brochure
Product Overview
Pressurized Potable Water Systems
Sewer Force Main Systems
Gravity Sewer & Drain Systems
DWV Systems
Show More

Backwater Valves and Terminal Backwater Valves Brochure

View
View All Brochure

Price List

View price lists and more. 

Municipal Price Lists
Municipal
Price List
Pressurized Potable Water Systems
Gravity Sewer Systems
Specialty Municipal Systems
Sewer Force Main Systems
Show More

Municipal Products Price Lists - June 16, 2025 (PDF)

View
Backwater Valves & Terminal Backwater Valves
Pool & Spa
Price List
Residential Pool & Spa Systems

Backwater Valves & Terminal Backwater Valves

View
View All Price List

Product Specs

View Interactive Parts Catalog
Product Options
Available in both in-line and terminal styles

Detailed Parts Catalog

View Detailed Parts Catalog
Show/Hide Columns
Show/Hide Columns
Reset
Part # Nom Size Sizing Standard Description Class Fitting Families End Type Box Qty Crate Qty Fitting Shape Fitting Size Color Resources
-
P0115
 15 PSM 15 In-Line Backwater Valve, SWS PVC White HxH DR 35 S-Series HxH 1 - In-Line Backwater Valve 15" White
  • Drawings
  • Installation Guide
  • Backwater Valves & Terminal Backwater Valves (PDF)
P0106
 6 PSM 6 In-Line Backwater Valve, SWS PVC White HxH DR 35 S-Series HxH 1 - In-Line Backwater Valve 6" White
  • Drawings
  • Installation Guide
  • Backwater Valves & Terminal Backwater Valves (PDF)
P0108
 8 PSM 8 In-Line Backwater Valve, SWS PVC White HxH DR 35 S-Series HxH 1 - In-Line Backwater Valve 8" White
  • Drawings
  • Installation Guide
  • Backwater Valves & Terminal Backwater Valves (PDF)
P0110
 10 PSM 10 In-Line Backwater Valve, SWS PVC White HxH DR 35 S-Series HxH 1 - In-Line Backwater Valve 10" White
  • Installation Guide
  • Backwater Valves & Terminal Backwater Valves (PDF)
P0112
 12 PSM 12 In-Line Backwater Valve, SWS PVC White HxH DR 35 S-Series HxH 1 - In-Line Backwater Valve 12" White
  • Drawings
  • Installation Guide
  • Backwater Valves & Terminal Backwater Valves (PDF)
P0204
 4 PSM 4 Terminal Backwater Valve, SWS PVC White H DR 35 S-Series H 1 - Terminal Backwater Valve 4" White
  • Drawings
  • Installation Guide
  • Backwater Valves & Terminal Backwater Valves (PDF)
P0206
 6 PSM 6 Terminal Backwater Valve, SWS PVC White H DR 35 S-Series H 1 - Terminal Backwater Valve 6" White
  • Drawings
  • Installation Guide
  • Backwater Valves & Terminal Backwater Valves (PDF)
P0208
 8 PSM 8 Terminal Backwater Valve, SWS PVC White H DR 35 S-Series H 1 - Terminal Backwater Valve 8" White
  • Drawings
  • Installation Guide
  • Backwater Valves & Terminal Backwater Valves (PDF)
P0104
 4 PSM 4 In-Line Backwater Valve, SWS PVC White HxH DR 35 S-Series HxH 1 - In-Line Backwater Valve 4" White
  • Drawings
  • Installation Guide
  • Backwater Valves & Terminal Backwater Valves (PDF)
Show
of 9 Results

Contact Us

Ready to place an order?

Contact a Rep

Interested in specifying WPF products?

Contact an Engineer
Explore the Municipal Segment Explore the Pool & Spa Segment