I have a new Fibreglass shower with the drain leaking. I think what happened is that the drain is hooked up with a rigid construction and any play in the shower pan caused the connection to break and of course is now leaking. I have cut a hole in my ceiling for the second time in a few months and wifey is getting pretty upset!! What is the best way to hook up these drains so there can be some play in the drain, would a rubber coupling work ? Please, any help would be appreciated