NOS Eliminates Cutting, Drilling & Modifications When Installing Nitrous on a Late model Fuel Injected Vehicle. Simply disconnect the OE Fuel Hose and Install this Adapter Between the OE Fuel Rail and Fuel Hose. The (3) 1/8" NPT Ports Can Be Configured in Any Direction For Best Fit In Your Application. The -4 AN Adapter is Used to Feed Fuel to Your Nitrous Plate. * Includes Main Body: fits 3/8 in. Tube and 3 NPT ports; 1/8 in. NPT Pipe Plus w/Sealant: steel w/nickel plating; 1/8 in. NPT Male to -4AN male adapter: steel w/nickel plating; OE Fuel Line Adapter 3/8 in. tube x 1/8 in. NPT Male.