Installation

The Mainline Fullport Backwater Valve's "normally open" design allows unrestricted sewage flow. Because of its Fullport design, it requires minimal homeowner maintenance when installed properly, and provides the best in backflow protection.

Installation of Backwater Valve

Retrofit Installation Of Backwater Valve

Testing the Unit

Mainline Fullport Backwater Valve Specifications

Access Box Specifications

How to Choose Which Valve I Need?

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