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.