backwater check valves backwater valves adapt-a-valve information ml fr4 fio valve information termex valve information straight fit backwater valves backwater valve diagram backwater valve features and specifications backwater valve history testimonials backflow prevention information helpful links backwater valve pricing frequently asked questions backwater valve specifications backwater valve installation tips backwater valve animation backwater valve videos contact us backwater valves main page backflow prevention links

 

how a backwater valve works - animation

 

to sewer (to sewer) - Watch here for an idea of how the gate raises to stop a backflow . . . ^^^^^ - (from dwelling) from dwelling