The OS-5500-020-B is the standard PTO-driven One Seven system for installation in municipal fire engines. The maximum One Seven foam volume is 5,500 l/min, the flow capacity for water/wetting agent is up to 2,000 l/min. The system is fitted with two foam generators which allow the simultaneous operation of one wet foam and one dry foam outlet. The OS-5500-020-B can supply two 3.0`` discharge outlets with a foam.