Compressed air to ISO 8573-1:2010 [-:4:-] inert gases. MSB Series FRL. The MSB series is a filter regulator with pressure gauge and proportional standard mist lubricator. It has a 40 m filter, lockable regulator head, plastic bowl / guard and manual condensation drain. Features and Benefits. Direction of flow: from left to right Manual rotary condensate drain 40 m filter Operating pressure: 1.5 bar to 14 bar Flow rate: MSB4 is 900 L/min, MSB6 is 3700 L/min Pneumatic connection: MSB4 is G1/4, MSB6 is 1/2 Corrosion resistance classification 2 (moderate corrosion stress) Aluminium diecast housing with plastic bowl and guard