Positive Seal Vented Fitting -12 AN

The Positive Seal Vented Fitting -12 AN from KEVKO Oil Pans & Components is a precision-engineered breather valve designed for serious engine builders and performance enthusiasts who demand reliable crankcase ventilation. This fitting addresses a critical need in modified engines: managing positive pressure within the crankcase while preventing oil mist and vapor from escaping into the atmosphere. Whether you're running a naturally aspirated stroker, a turbocharged build, or a high-RPM race engine, proper crankcase evacuation directly impacts ring seal integrity, bearing longevity, and overall engine reliability.

This -12 AN rated fitting uses a positive seal design that allows controlled venting while minimizing oil loss and vapor leakage—a distinct advantage over simple open-pipe breathers on high-boost or high-RPM applications. The -12 AN sizing (0.75-inch inner diameter) provides substantial flow capacity without creating unnecessary backpressure that can blow out gaskets or seals on your oil pan, valve covers, or transmission. KEVKO's precision manufacturing ensures consistent thread engagement and leak-free operation across temperature and pressure cycles, making this fitting a trusted choice for street rods, circle-track racers, and engine shops that build to exacting standards.

Mechanics and engine builders benefit most when integrating this fitting into closed-loop PCV or catch-can systems, where it serves as the primary outlet valve between the engine and the recovery reservoir. Its design is particularly effective for applications requiring high-performance crankcase ventilation, ensuring that oil mist is contained while allowing for necessary pressure relief. This fitting is compatible with various engine platforms, including LS, Small-Block, Big-Block, and Ford engines.