There are detailed instructions here:

: I have completely demoed my existing bath room and want to install a new tile shower. I have found lots of information and feel comfortable doing it. ONe question however. All the info I find shows put in the drain assembly after laying down the membrane. If the drain assembly is already in place from the previous shower, do I need to remove this or can I place the new membrane over and will the glue around this be suffient?

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