SKU: VIB10996
UPC: 690092174316
MPN: 10996
The Vibrant Performance Low Profile O-Ring Boss Port Plug in -16 AN is a slim, low-clearance plug built to seal unused O-Ring Boss ports on fuel rails, coolant manifolds, oil pans, and custom plumbing blocks. It's made for builders running -16 AN systems who need a clean, permanent cap on a port they aren't using. The low-profile head sits close to the surface, so it works in tight engine bays and against adjacent fittings. The integrated O-ring handles the seal, and the internal Allen drive keeps the install flush. See our full range of fittings, hoses, and valves for matching hardware.
This plug is machined from 6061 aluminum alloy and finished in black anodize, which adds corrosion protection and keeps the look consistent with other anodized AN hardware. The captured O-ring seals against the boss face for leak-free performance, while the internal Allen hex lets you torque it down with a standard key rather than a wrench around the outside. Package dimensions run 2.0 inches wide by 0.5 inch tall by 2.0 inches long per retailer specifications, and the assembly weighs roughly 0.1 lbs. The low-profile design is the main draw here, it clears nearby lines and components where a tall plug would interfere. The threads match the -16 AN boss standard, so it drops into any correctly sized port.
Use this plug when you delete a port on a fuel cell, swap to a different return setup, or block off an unused boss on a billet manifold. It keeps dirt and debris out of exposed threads during a build and provides a sealed termination once the system is live. Pair it with the matching -16 AN plugs or step down to other sizes from our -16 AN caps when you need to close off a male line end instead of a port. Browse the wider fitting selection to round out a build.
It seals an unused O-Ring Boss port on a fuel rail, coolant manifold, oil pan, or billet block. The captured O-ring presses against the boss face to create a leak-free seal, and the plug threads match the -16 AN boss standard so it drops into any correctly sized port.
The low-profile head sits close to the mounting surface, which clears nearby fittings, lines, and components in tight engine bays. A taller plug can interfere with adjacent hardware, so this design helps in builds where clearance around the port is limited.
The plug uses an internal Allen hex drive, so you install and torque it with a standard Allen key. That keeps the install flush and avoids needing a wrench around the outside of the head, which is useful in confined spaces.
It's machined from 6061 aluminum alloy with a black anodized finish. The anodizing adds corrosion resistance and matches the look of other anodized AN hardware in a build. The assembly weighs about 0.1 lbs per retailer specifications.
No. This is a port plug for an O-Ring Boss female port, not a cap for a male AN line. To close off a male hose end, use a -16 AN cap instead. Match the plug to the boss port and the cap to the male thread.
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