A deb jug is another way to describe an oil sight glass. Use a deb jug on a pump or turbine or gear box. It 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. Regular pump inspection with an oil sight glasses by PK Machine provides crystal-clear visual inspection. An oil sight glass is a magnified view of the presence of sediment inside equipment.