The MagnaTrack exhaust nozzle is a generous eight inches in diameter to allow up to 50 percent ambient air dilution. This cools the hot exhaust gases down significantly. Cooler airflows mean longer life for all system components. The nozzle is supported by an internal leaf spring so the hose does not support the weight of the nozzle. The hose is designed for engine pump checks for as long as department procedures dictate.