4" PVC Back Water Valve, Lead-Free

Clean Check® 4" PVC Extendable Backwater Valve – Prevent Sewage Backflow with Confidence

The Clean Check® 4" PVC Extendable Backwater Valve offers a dependable solution for preventing unwanted backflow in residential and light commercial drain systems. Designed to stop reverse flow caused by overloaded sewer lines or flooding conditions, this valve provides above-ground access for service and inspection, making it a trusted choice for contractors working in flood-prone or high-volume areas.

Engineered for Below-Grade Installation and Above-Ground Service

This valve is built with a telescoping design that accommodates variable burial depths up to 12 feet. It eliminates the need for costly manholes by providing ground-level access through an extendable cleanout. The internal flapper opens under normal flow conditions and seals tight when backflow pressure is present, offering passive protection without the need for power or sensors.

Product Highlights

• 4" PVC Schedule 40 Construction – Corrosion-resistant body ideal for underground use.
• Extendable Design – Customizable riser system allows for service from finished grade without excavation.
• Flapper Backwater Prevention – Gravity-operated valve disc closes when reverse flow occurs.
• Direct Burial Approved – Designed for subsurface installation without requiring a vault or manhole.
• Tool-Free Access – Removable top cap allows quick internal inspection and cleaning.

Specifications

• Nominal Size: 4” (compatible with 4” PVC drainage systems)
• Pressure Rating: 75 PSI static
• Valve Width: Approx. 10.2"
• Height (Base Unit): Approx. 10"
• Material: PVC with flapper-style check mechanism

Installation Considerations

This valve is typically installed in horizontal building sewer lines and should be placed downstream of fixtures requiring protection. Installation requires proper bedding, alignment, and solvent-welded PVC connections. Contractors should reference local plumbing codes, which often require backwater protection in basements or below-grade spaces. The unit is compatible with standard cleanout covers and extension kits for various burial depths.

Designed for the Field

Unlike traditional in-line check valves that may be difficult to service or replace, the Clean Check system offers surface-level access, reducing maintenance time and avoiding excavation. Its flapper mechanism is field-proven and operates silently under gravity conditions. Ideal for both new construction and retrofit installations, it provides long-term protection with minimal intervention.