Review on Zoeller 540-0005 FLEX Series Water-Powered Back-Up 💦 Sump Pump: Reliable and Efficient Emergency Water Removal Solution by Mike Anderson

First, the one they sent me was definitely used. Two o-rings were broken and silicone/sealant was applied in their place, this will affect the functionality of the unit and will determine how you will install it. In my case I was able to fix it myself but for how much it cost it shouldn't even have been a problem. Second, there is no built-in backflow/backflow protection, so you will need to purchase a double check valve with atmospheric valve as it connects directly to your drinking water supply. when we are on vacation or away from home, when the electricity goes out or also when the main drain pump is a bit clogged.