4 way diff gearbox breather kit to fit WG/WJ Jeep Grand CherokeeAs a recreational off roader there is bound to be tracks you come across with stream or river crossings and even more common mud or bog holes. For these occasions we fit snorkels to our vehicles to allow our engines to still get clean air even in the deepest holes or crossings. Many people forget that there differentials, gearboxes and transfer cases all have breathers as well and can be as low as the centre of your wheels which get easily submerged