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You're right, the sink and shower are connected in the horizontal run of the soil pipe, probably with a T. Is there a better connector to replace the T with? Would it help to install a non-return valve on the shower branch or are they not good enough? I can't run a second pipe, but i could move...

I had a bedroom converted into a bathroom with sink and shower. Both have traps, connected to a 40mm waste pipe that runs under the floor practically horizontal with several 90 degree bends for 2 meters, then on a 1:30 incline and into a soil stack. I have two problems that happen only...