This is how I installed it. It works as a back up to your regular sump pump. It is powered by water pressure from your public water lines. People with wells are unfortunately out of luck. About once a year my basement floods because of the sump pump not running. I used pex because it was easier to fit behind the furnace and other things in my basement. It’s also cheaper than copper. Although I would have used copper if I could. That first valve I soldered in was solely because I don’t trust pex for the long haul, but figured it should be good enough. Other people may install it differently. That’s my disclaimer. Please add your comments about your own sump pump adventures.
———Update: April 3, 2024. Our power went out during a storm. The new back up pump did work and is happily pumping water out and making me breath a sign of relief. To my surprise, it did NOT MAKE A SOUND. It was absolutely silent. I didn’t even think it was on until I went outside to see the water being pumped out. The basement stayed dry.