all plumbing went well. NO LEAKS. Thank god. I know that the switches seem to be blocked by the plumbing , but it really was no problrem. Plenty of room to turn on and off, and I always make 1 and 2 postions my protein skimmer and return pump. The auto top off went well in return section of sump, just had to adjust the fill height because the sump holds more water, tested works great.