I like rain barrels. I've written about several projects that I've done with them. One of the issues that I have had is moving the water. All of my rain barrels are plumbed together. I can transfer water between them by turning valves and letting gravity do the rest. This takes a long time. I'm also only able to transfer water down hill. The 5 barrels I have in my front yard are at the same level, but my barrels in the back yard are lower.
I decided that it was finally time to get a pump. I've looked at several types but finally decided on an RV pump. It's the Shurflow 4008-171-E65. I decided on this pump for a few reasons. It has a pressure switch built in and shuts off automatically when it reaches 55 PSI. The other big reason is that it can be run dry. It can suck a barrel empty and not be harmed. It's also thermally protected and shuts itself off if it gets too hot.
There are a few downsides. It didn't come with a plug. I had to pick up an appliance cord at Home Depot. Also, there's no ON/OFF switch. I haven't found that to be a big deal, but I thought I'd mention it.
strainer to catch debris that might otherwise enter the pump.
brass FHTxFHT fitting.
With this setup I was able to verify that the pump does shutoff when high enough pressure is reached. It's supposed to shut off at 55 PSI, but my gauge looked like it was closer to 48 PSI. Who knows, maybe the gauge isn't right. I'm not going to worry about it.
grass with rain water!