Is dirt becoming a problem for your engine? Another way to ensure the life of your engine is to consider adding a Vortox Breather Cap to your filter system. Vortox Air Technology, Inc. Breather Caps have the ability to work in negative and positive pressure environments, limit the work load of a filter, and provide further protection from agents that harm engines. Look at our line of Breather Caps to decide which is the right size and style for your needs.