About a year ago I got a Shurflow 4008 RV pump to move water out of my rain barrels. I've used it on and off since then. I ran into a few issues. The first is that I ran out of water frequently. I'm hoping that I have alleviated that problem by adding more barrels. The other, and bigger issue is that the pump doesn't shut off when the barrel is empty. It just continues to run and get very hot. I needed to add a float switch to keep this from happening.
I started by putting 3/16" quick disconnects on two wires of the float switch. I had to order the male disconnects from Amazon. The female ones came from Auto Zone.
The final step was to drill a hole in the lid, insert a grommet, and run the 10' cord through it.