AN Reducers, Expanders, Plugs & Caps

The Ultimate System Adapters and Finishing Hardware

In a perfect world, every component in your fluid system would use the same size fitting. In reality, performance builds often require adapting between different hose diameters or sealing off unused ports. At AN Fittings NZ, our range of Reducers, Expanders, and Plugs provides the versatility you need to customize your plumbing without compromising flow or safety.

From block-off caps used during off-season storage to flare expanders that allow for increased flow capacity, these precision-machined components are the key to a modular and professional fluid system.

Precision Components for System Flexibility

Our inventory is designed to help you navigate the "final 10%" of your plumbing project:

  • AN Reducers & Expanders: These allow you to jump between sizes (e.g., from a -10AN port down to a -8AN line) while maintaining a high-pressure seal. Our Speedflow reducers are designed with a smooth internal taper to minimize fluid turbulence.

  • AN Extensions: Perfect for when a port is recessed or buried behind other components. These extensions provide the extra clearance needed to attach your hose ends without interference.

  • AN Plugs (Male): Used to seal off unused ports in fuel rails, oil blocks, or surge tanks. Available in flare or O-ring port styles to suit your specific application.

  • AN Caps (Female): The professional way to seal off a hose end or a male fitting. These are essential for preventing contamination during engine swaps or for "blanking off" lines that are no longer in use.

  • O-Ring Port (ORB) Plugs: Specialized plugs for components that use an O-ring seal rather than a taper, ensuring a leak-free finish on modern aftermarket fuel and oil accessories.

Reliability for the NZ Performance Community

All our adapters and caps are CNC-machined from 6061-T6 aluminum and finished with high-quality anodizing. In the high-vibration environment of a performance car or boat, a simple plastic cap isn't enough. Our aluminum hardware provides the structural integrity and thread precision required to keep your system airtight and leak-free.

Find the missing piece for your build in our collection of AN reducers and plugs. Browse the range below for fast shipping across New Zealand.