A water finder is also called an oil sight glass. It is an early indicator of wear on the bearings in a pump as it helps to visually show water in oil, for example. An oil sight glass will be an early indicator of wear on the bearings in a pump. As a result, the pump can work more effectively. Use a water finder on a pump or turbine or gear box. As a result, a water finder will reveal changes in machinery lubricant quality. The condition of the oil, if clear or cloudy is an early indicator of wear on the bearings. The oil sight glass alone is not preventing moisture from entering your reservoir or removing any water that has become emulsified in the oil.