Universal for EFI fuel rails with female 8AN ORB ports. 8AN ORB male threads with Viton O‑ring sealing. Replaces Radium 20‑0176 (updated Dec 2022). Threading: 8AN ORB male. The Radium 20‑0776 FPD‑R is a universal direct-mount fuel pulse damper designed to install directly into an 8AN ORB-equipped EFI fuel rail.