Adjustable Constant Level Lubricators with Low Level Safety Switch and Oil Level Sights automatically maintain a fixed liquid level in a bearing housing or gear box using the liquid seal principle.  The factory set liquid level, marked on the outside of the lubricator, can be raised or lowered 1/4” up or down for a total adjustment range of 1/2".   There is a large sight for viewing the liquid level and condition.  This Constant Level Oiler features a low level safety switch that can be used to actuate warning devices or shut off a machine when lubricant levels become too low.  The lubricators can be used on sleeve bearings, anti-friction bearings, gear boxes, pump housings, ventilating fans and blowers, moistening pads, and any other application demanding the maintenance of a constant liquid level.