The Innovative Controls Inc. model 3050509 Pump Interlock Module is used to prevent unsafe shifting of the pump transmission as required for NFPA 1901 16.10.1.4, 2016 edition. The Pump Interlock Module will only allow shifting to occur when the transmission is placed in neutral. In road mode, the module protects the pump gear box from damage by preventing shifting while the transmission is in gear. In pump mode, the module interlocks the pump gear box to prevent erroneous shifting into road mode.