Port Plug O-Ring Seal 12an (1pk)

The Port Plug O-Ring Seal 12AN from EARLS is a precision hydraulic fitting component designed for high-pressure fuel, coolant, and fluid transfer systems in modified and performance vehicles. This sealed plug assembly prevents leakage at manifold ports and adapters where hose connections are not required, making it essential for custom fuel rail setups and standalone engine management installations.

Designed for 12AN SAE port configurations, this o-ring seal uses elastomer construction to maintain a permanent, pressure-rated bond across temperature swings common in performance applications. The EARLS engineering ensures the o-ring seats concentrically and resists extrusion under peak boost pressures, while precision machining of the port threads and seal cavity means no custom modifications are needed—drop-fit installation on any standard 12AN port.

Mechanics and tuners favor EARLS seals for LS engine conversions and EFI fuel rail builds where port abandonment demands a leak-free blank. This single-unit pack is ideal for one-off repairs or custom fabrication work, making it a reliable choice for automotive enthusiasts.