![Mystery: water backs up in my kitchen sink and would not flow (drain). No clogs. Why and what should I do? Please see images with captions for explanation : r/Plumbing Mystery: water backs up in my kitchen sink and would not flow (drain). No clogs. Why and what should I do? Please see images with captions for explanation : r/Plumbing](https://preview.redd.it/mystery-water-backs-up-in-my-kitchen-sink-and-would-not-v0-e833l4n9xr9b1.jpg?width=640&crop=smart&auto=webp&s=72411f024e414250f2e953628a85d098ea0071bf)
Mystery: water backs up in my kitchen sink and would not flow (drain). No clogs. Why and what should I do? Please see images with captions for explanation : r/Plumbing
![Water comes up through the kitchen sink plug hole when the washing machine drains. What should I know before attempting to fix this? : r/DIY Water comes up through the kitchen sink plug hole when the washing machine drains. What should I know before attempting to fix this? : r/DIY](https://i.redd.it/ll5wm22t231c1.jpg)
Water comes up through the kitchen sink plug hole when the washing machine drains. What should I know before attempting to fix this? : r/DIY
![New waste water trap or sink drain connected to the bottom of the old kitchen sink. Install, clean and repair of domestic plumbing fixtures Stock Photo - Alamy New waste water trap or sink drain connected to the bottom of the old kitchen sink. Install, clean and repair of domestic plumbing fixtures Stock Photo - Alamy](https://l450v.alamy.com/450v/2cexefy/new-waste-water-trap-or-sink-drain-connected-to-the-bottom-of-the-old-kitchen-sink-install-clean-and-repair-of-domestic-plumbing-fixtures-2cexefy.jpg)