Mayes Level 10309 Water Level This item is Mayes Level 10309 Water Level Used for Test & Measurement, Levels The product is manufactured in United States 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