Rain barrel. Note spigot on bottom, overflow valve on top. 20 Insanely Clever Gardening Tips And Ideas July 1, 2016 by admin Rain barrel. Note spigot on bottom, overflow valve on top. 20 Insanely Clever Gardening Tips And Ideas Click HERE or Tap HERE to get instant access to over 7000 of the freshest landscaping ideas & videos to help you create your dream landscape... And you can start in the next 7 minutes!