Breather Crankcase Vent Tube 3/8"(9.5mm) Black Top Black Element (Ref K&N 62-1000). The filter is 40mm tall, 50mm in outside diameter with a 9.5mm (3/8 inch) diameter black tube is designed to push in and clamp directly on to metal or plastic tubing where venting is needed. Constructed with a synthetic filter media it can be cleaned and reused repeatedly.