Breather Crankcase Vent Tube 1/2"(13mm) Chrome Top Red Element (Ref K&N 62-1015). The filter is 40mm tall, 50mm in outside diameter with a 13mm (1/2 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.