I have an unfinished basement that I am building a bathroom in. The floor in the basement is concrete, however the builder did install the PVC pipes in the cement floor so that the bathroom & plumbing is ready to be finishied. My question deals with how to install the shower draain so that it won't leak and is flush with my finished tile shower basen?

The existing PVC pipe for the shower drain sticks out of the cement floor by about 10" and is centered in a largre PVC pipe that is flush with the concrete.