A sealed design prevents contamination in dirty and dusty environments. Install a line between the reservoir's pressure port and the lubricated equipment to balance pressure. Designed to maintain a constant level of oil in bearing housings, gear boxes, and similar closed machinery, when oil falls below the set level, these reservoirs automatically replenish the supply. They have oil outlets on the side and bottom for flexibility in installation. For applications that require adjustable flow control, pair with a flow-adjustment valve (sold separately).