I'm planning on installing a new shower that's bigger than my existing one. My existing shower is 34" by 36". The new shower will be 36" by 36". I think that the drain will not align exactly with the new shower. Do I have to break up the concrete and reposition the drain line or is there an adapter available to make the connection without have to dig and reposition the drain line? The shower is in the basement so my only option is to dig and reposition if there isn't an adapter available?