THE VMS RACING NITROUS LINE ADAPTER IS MACHINED FROM HIGH QUALITY CNC BILLET ALUMINUM AND IS THEN ANODIZED IN SILVER FOR A QUALITY FINISH AND DURABILITY. THIS ADAPTER WILL MOUNT UNDER THE FACTORY FUEL PRESSURE REGULATOR AND HAS A 1/4" NPT TO -4AN PORT TO INSTALL YOUR NITROUS LINE AND A 1/8" NPT PORT TO MOUNT YOUR GAUGE.