New K&N clamp on crankcase vent breather for Datsun 240Z, 260Z and 280Z 1970-78. This breather will clamp on to the steel tube that comes out of the block which is located under the intake/exhaust manifold at the front of the engine. . Replaces the hose that runs up to the air cleaner. This breather will clamp onto 1" tubing. Breather is 2.5" tall & 3" diameter. This K&N filter has a black rubber top. Some late 280Z's used a smaller 5/8" tube for the block vent. See our other listing for the vent filter with a chrome top.