6.0L / 6.4L Powerstroke Blue Billet Aluminum Oil Filter Cap with Test Port This billet aluminum cap is the last fuel cap you will ever need - no more plastic caps that round off easily! Includes built in 1/4 in NPT port for measuring oil pressure, or temperature Bright BLUE color to dress up your engine compartment; Proudly made in the USA For all 2003 - 2010 6.0L and 6.4L Powerstroke Diesel Trucks (Not Vans) Also provides an ideal point for connecting a bypass oil filter system