What 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. DON’T risk it! Fit and HKB breather kit and the problem goes away. As the suction point is moved up high above the water line just like a snorkel. Its a cheap way to ensure reliability and easy to fit. HKB Performance breather systems are made up of some of the best components available to ensure longevity and functionality. Heavy duty 316 stainless steel angle fixture with dual mounting methods High Flow 1/4 inch conical sintered breathers with 40 micron-filtration rate Stealth black push fit fittings with high temperature resistant locking collars. Custom made heavy duty black HKB breathing tube High quality black cable ties 304 stainless steel mounting screws