8AN ORB Plug (14-0150) by Radium. Designed specifically for OEM (R32/R33/R34) RB26DETT intake manifolds. It features a large 0.69" internal diameter bore to suit even the most fuel hungry engines. The rail is CNC machined from a custom 6063 aluminum extrusion and black anodized and laser etched for a high quality surface finish. This product is made of high-quality materials to serve you for years to come. Designed using state-of-the-art technology and with customers in mind. It will meet your needs and deliver great quality at an affordable cost.