Need help identifying backwater valve

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Donny Jilek

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Valve is from a house that was built mid 70s. Need help identifying brand and if still around. Thank you in advance
 

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Donny Jilek

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My first thought is this guy is a collector.

My second and third thoughts were that his basement flooded and ....

I got some water in the basement, the plumber went through the valve and the flapper was corroded but cleared the main drain
 

Reach4

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Flapper type sewage check valves are nearly guaranteed to leak. These are sometimes called normally closed. Debris will hold the flapper open after a while.

There is a better type called a normally open backwater valve that only closed in backup situations.

The gold standard in sewer backup protection is overhead sewers. Yes, it costs. There is another system that puts a pit in the yard. That pit has a normally open backwater valve, and a sump pump. The sump pump outputs injects downstream of the backwater valve.
 
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