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I do not think your T&P valves have failed.
I think they are working exactly as designed to do.
A T&P valve discharges for 2 reasons Temperature & Pressure.
Most in a residential application will discharge at 150 Psi. or, at 210 Degrees F.
You need to take some tenperature & pressure measurements to determine the cause, Most of the time we see a discharge due to thermal expansion. Usually a discharge of about a coffee cup or 2.
Do you have a pressure reducing valve installed on your house?
Go you have an expansion tank installed on your water heater?
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For great information on the history of sanitary sewers including the use of Redwood Pipe
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Did you know some Redwood Pipe is still in service today.
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