NEW OEM Nissan rear differential vent tube. This diff vent will fit Datsun 510, 240Z, 260Z, 280Z & 280ZX 1968-83. This rear differential vent tube goes in the top of the diff & allows air to escape but will not allow debris & moisture to get in. A plugged or damaged vent can cause pressure to build in the differential & oil leaking or possible blow out an oil seal.