As opposed to "reef" plumbers. 
I am taking out the fixtures in a downstairs bathroom so I can use it as a sump room for the reef that will be upstairs on the main floor (its sort of a raised ranch). I removed the toilet, and would like to replace it with a floor drain. The line is cast iron and just runs straight down into the slab where it joins other drain lines. Is there some kind of "internal trap" I can place in the line under a drain grate? Don't want the stank in my pad.
I've looked online but I must not be using the right search terms...

I am taking out the fixtures in a downstairs bathroom so I can use it as a sump room for the reef that will be upstairs on the main floor (its sort of a raised ranch). I removed the toilet, and would like to replace it with a floor drain. The line is cast iron and just runs straight down into the slab where it joins other drain lines. Is there some kind of "internal trap" I can place in the line under a drain grate? Don't want the stank in my pad.
I've looked online but I must not be using the right search terms...


