Hi, Yes the pipes are missing. I'm happy to do the pipework myself. I just need to know how the system works. Then I can sort it out.Welcome to R2R! Nice tank. It looks like the overflow is already built. Do you just need to hook the tank to the sump or are the pipes in the overflow also missing? You may want to contact the manufacturer to see if they have the plumbing available which would be easier than re-designing it from scratch.