Housing construction is stainless steel (SS) for the premium type. Components are high quality and the separators are designed for long, trouble-free service life. Maintenance required is minimal, but it is important that it be performed to ensure proper operation. Separation means is by polypropylene bead packs. Dual bead packs are provided for the premium units. Dual element sensing probes are utilized to more positively determine the oil level and discharge the oil when necessary.