Breather Crankcase Vent Tube 5/8"(16mm) Black Top Red Element (Ref K&N 62-1020). The filter is 40mm tall, 50mm in outside diameter with a 16mm (5/8 inch) diameter zinc 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.