Vacuum Pop Off - 12an Inline

The Vacuum Pop Off - 12AN Inline from Peterson Fluid is a precision breather adapter engineered for high-performance engine bay applications where vacuum regulation and crankcase ventilation demand reliability. This component serves as the critical link in your engine's PCV system, allowing controlled evacuation of crankcase gases while preventing backflow that could compromise oil seals and gaskets. Whether you're building a street-driven performance engine, a competition vehicle, or managing a complex custom cooling system, this inline adapter delivers the dependable vacuum control that professionals and serious enthusiasts trust.

Constructed from black anodized aluminum, the Vacuum Pop Off - 12AN Inline features a baffled design that optimizes flow characteristics while separating oil mist from escaping vapors—a critical function in maintaining clean intake air and preventing carb or fuel injection fouling. The 12 AN connection standard (equivalent to 3/4-inch hose ID) integrates seamlessly into modern modular fuel and cooling systems, while the screw-on to clamp-on conversion geometry accommodates both hard-line and flexible hose configurations. This dual-connection design eliminates the need for multiple adapters, reducing complexity and potential leak points in your vacuum circuit. At just 0.34 lbs, the compact form factor (2.8 x 1.75 x 6.4 inches) fits tight engine compartments without sacrificing durability or flow efficiency.

Builders and mechanics rely on Peterson Fluid breather adapters to handle sustained vacuum loads in forced-induction setups, naturally aspirated performance engines, and rebuild scenarios where OEM ventilation routing is inaccessible or inadequate. The baffled aluminum construction resists corrosion and thermal cycling, ensuring long service life in underhood environments. Installation is straightforward: position the adapter in your vacuum line, secure via the threaded and clamp-style connections, and verify all fittings are torqued to prevent weeping. This adapter pairs effectively with custom air cleaner assemblies, remote oil catch cans, and integrated PCV systems where inline vacuum management is non-negotiable.