NPT & BSP Adapters

The Essential Bridge for Your Fluid System

When building a custom performance system, the biggest challenge is often connecting modern AN lines to existing engine components, pumps, and gauges. At AN Fittings NZ, our selection of NPT and BSP adapters provides the precision-engineered link you need to integrate your plumbing seamlessly.

Whether you are working with an American-spec block (typically NPT) or a European/Japanese application (typically BSPP or BSPT), we stock the high-quality adapters required to convert these threads to a standard AN flare. Our adapters are manufactured from high-grade 6061-T6 aluminum or plated steel to ensure a perfect, leak-free seal every time.

Navigating NPT and BSP Thread Types

Choosing the right adapter is critical to avoiding leaks and damaged threads. Our range covers all common performance automotive requirements:

  • NPT (National Pipe Thread): The American standard tapered thread. Commonly found on turbo housings, fuel pumps, and intake manifolds. Because the threads are tapered, they create a seal as they are tightened.

  • BSP (British Standard Pipe): The standard for most European, Japanese, and British vehicles.

    • BSPP (Parallel): Uses a crush washer or O-ring for sealing (common in oil and fuel blocks).

    • BSPT (Tapered): Seals on the thread, similar to NPT but with a different thread pitch and angle.

  • AN to Pipe Conversions: We offer a massive variety of sizes, including 1/8", 1/4", 3/8", 1/2", and 3/4" in both NPT and BSP, allowing you to jump straight to your required -4, -6, -8, or -10 AN lines.

Precision Engineering for Leak-Free Reliability

Don't risk your engine on low-quality hardware. Our Speedflow and performance adapters feature CNC-machined threads and hard-anodized finishes for maximum corrosion resistance and durability. Whether you’re plumbing an oil pressure sensor, a radiator overflow, or a custom fuel surge tank, our adapters provide the professional finish your build deserves.

Shop our full range of NPT and BSP fittings below. Unsure which thread type you have? Contact our NZ team for expert help in identifying your fittings.