4 Way Driveline Breather for Toyota LandCruiser 100 SeriesWhat does it do ! Its simple; Vehicle Differentials and Transmissions have to breathe due to change of temperature and the factory fitted breathers often sit on top of the Diff. If that factory breather goes under water or in mud, the debris can get sucked into you drive chain. Now that literally SUCKS the crap in, cause real wear problems and you might find yourself stuck on the road. DONT risk it! Fit and HKB breather kit and the problem goes away.