The Henry Technologies S-9130-4 Oil Level Regulator is a precision control device designed to maintain the proper oil level in refrigeration and HVAC compressor systems. Commonly used in commercial refrigeration units, condensing units, and parallel compressor racks, it works by automatically regulating the flow of oil from the reservoir to the compressor crankcase as needed. By ensur... https://www.partshnc.com/s-9130-henry-technologies-4-oil-level-regulator