I have a basement stationary tub / sink into which the washing machine empties. The drain on this tub is PVC, and simply goes straight down into the floor. There is no trap, it simply goes straight down into what appears is a larger pipe that at floor level. Since there is a difference in the diameter of the pipes, it looks like some sort of concrete type substance is all that is joining the pipes together, rather than any sort of adaptors or gaskets.
Is it normal to have a sink with no trap in this situation?
There is no sewer smell coming up from the drain, and it doesn't seem to be causing any problems. Do I need to consider adding a trap?
Thanks in advance.
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