Manual/semi-auto drain as standard. Rolling membrane regulator with secondary bleed and adjustable knob. 20?m element as standard. Constant oil flow. Fully assembled units comprise a combined filter, regulator and lubricator in a modular configuration. | Body: technopolymer. | Bowl: polycarbonate with protector. | Filtration size: 20?m. | | Features and Benefits | • Constant oil flow allows for a long lifespan | • Manual/semi-auto drain as standard, allowing for easy maintenance