TheBAK-Q80, BAK-Q60 fuel filler security models work by monitoring the presence of the transponder, situated in the fuel plug over the plug module. The plug module can be connected to the tracking device via a digital input. When the fuel plug is open, the system interprets that the output state has changed. The anti-theft strainer module consists of a pipe with perforated walls and bottom. The shape of the bottom and the holes has been designed as not to obstruct the fuel filling operation, while at the same time it protects from fuel theft.