do any non return valves exist that are fit and forget and could these
be buried underground?
I have had lots of problems when the local main sewer backs up & it
flows out from the drain in the garden, I usually can block this with a
towel and bricks, but if we are not there the garden/garage fills up
with raw sewage this can happen if the local river rises or after heavy
rain or the local sewer pump fails, our drain seems to be the lowest
this drain only serves 1 sink and a dishwasher
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