Air to the tires is supplied through conduits inside the axle so no lines are externally visible. The exclusive and durable VIGIA rotating valves are placed outside the hubcap preventing water and other contaminants from entering the hub.
Since pressurized air travels inside the VIGIA lines, there is no pressure building inside the axle or hub nor oil leaking out the hubcap.
Model NM247 is a stand-alone system for trailers.
Model NM248 is a dedicated system for trailers and requires a tractor or trailer leader equipped with VIGIA System.