Say No & Trash That Battery Sump Pump & Install a Liberty Pumps SJ10 BackUp Sump Pump. Update 2015 With Watts #7 Dual Check valve Installed To Prevent Backflow. every 1 gallon of water that goes in 2 come out.
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You can purchase at ebay & Amazon. Links are in description. under video.
https://rover.ebay.com/rover/1/71153...
https://www.amazon.com/gp/search/ref=... Pumps SJ10 SumpJet&index=aps&camp=1789&creative=9325&linkCode=xm2&linkId=2d401452e464cff5baffcf3005207f60