Edelbrock`s Elite Series valve cover breathers are made of die-cast aluminum and are polished to a high shine. They have an allen head bolt-on cover for access to their internal foam filter and come available either with or without the famous Edelbrock script logo. These breathers will match your Elite Series valve covers. They also come in your choice of a bolt-on 90 degree side-mount type, a bolt-on 30 degree top-mount style or a push-in top-mount type. The internal foam filter element won`t leak or clog, the way those other types of breathers on the market can.