Can Be Used Indoors or Outdoors Attaches to Any Standard Hose Handy Shut-off Valve Breather Caps to Equal the Water Level Instructions Included Simplifies yard-grading fence building and many other jobs Accurate level points, sides or surfaces Two clear plastic tubes with shut-off valve and breather caps attach to any garden hose Operates on the basic law that water seeks its own level Can be used indoors or out, around corners