This fuel rail features ports that are -8AN ORB female

Included
-Black Anodized Aluminum Fuel Rail
-Black Anodized Aluminum Mounting Feet (x3)
-Stainless Steel Mounting Feet Bolts (x6)
-Phenolic Mounting Bolt Washers (x3)
-Radium 20-0161-04, 25mm Injector Seats

This Radium Engineering fuel rail is a direct bolt-on with the Nissan SR20VE engines originally found in the following: 

JDM 97-00 Nissan U14 Bluebird SSS-Z
JDM 97-00 Nissan U14 Wingroad ZV-S
JDM 97-00 Nissan P11 Primera Te-V
JDM 97-00 Nissan P11 Primera G-V

Manufactured with a large 0.69" internal bore, the fuel rail can support all necessary engine power requirements. The Radium fuel rail converts the OEM side feed fuel injector setup to top feed allowing the use of high flow 14mm O-ring fuel injectors (not included). This rail is compatible with E85. The rail is extruded and CNC machined from solid 6063 aluminum and black anodized for a high quality surface finish. With the combination of the OEM insulating spacers and the included phenolic mounting washers, the fuel rail is 100% isolated from intake manifold heat transfer.