Flapper Drain vs. Trap??

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Is there any type of flapper drain for a shower stall that can be used in a location where a trap wont fit? The location of a T-fitting in the cast iron pipes under my basement slap will not allow for a trap to be installed in the shower stall I am trying to put in. The trap will fit under drain, but no combination of fittings will allow for a connection to the rest of the drain pipes.Thanks!

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