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NPT (national pipe taper) Male to AN Male Adapter fitting
$6.99 USD
Free Shipping $99+
Lifetime Warranty
Expert Support
NPT to AN Adapter Fittings
NPT to AN Adapter Fittings — Reliable Fuel & Oil Connections
Convert traditional NPT (National Pipe Thread) ports on fuel pumps, sending units, fuel rails, and regulators to precise AN (Army-Navy) flare connections. These adapters deliver a secure, leak-resistant interface that stands up to high pressure and vibration in performance builds and racing environments.
Crafted from durable, corrosion-resistant anodized aluminum in a sleek black finish and available in straight, 45°, and 90° angles to fit tight engine bays and custom layouts.
Key Benefits
- Fast conversion: Bridge NPT ports to AN flare systems across fuel and oil plumbing.
- Leak-resistant: AN 37° flare seals metal-to-metal; NPT side threads with sealant.
- Built to last: CNC-machined anodized aluminum resists corrosion and harsh conditions.
- Angles for any layout: Straight, 45°, and 90° options simplify routing.
Technical Specs
| Thread Type (Side A) | AN male, 37° flare (no sealant required) |
| Thread Type (Side B) | NPT male, tapered thread (use thread sealant) |
| Material | Anodized aluminum |
| Finish | Black anodized, corrosion-resistant |
| Available Angles | Straight, 45°, 90° |
| Typical Applications | Fuel pumps, sending units, fuel rails, regulators, custom EFI plumbing |
| Sealant Note | Apply Teflon thread sealant on the NPT side ONLY. Do not use on AN flare. |
Why Convert NPT to AN?
NPT seals via tapered threads and sealant—effective, but prone to loosening under vibration. AN uses a repeatable 37° flare for a robust metal-to-metal seal. With these adapters, you keep existing NPT ports while stepping up to leak-tight AN plumbing for modern EFI performance.
Recommended Pairings
- AN PTFE Hose & Fittings Bundles — build clean, reliable lines to match your adapters.
- AN Adapter Fittings (Full Collection) — reducers, expanders, ORB, caps & plugs, and more.
- Gauge/Pressure Port AN Adapter — add a sensor or gauge easily.
- Hardline Tube to AN Fittings — transition factory hardline to AN flare.
- AN Hose Installation Tools — faster, cleaner assembly with fewer do-overs.
Install Tip
Important: Apply Teflon thread sealant to the NPT side only. Do not use sealant on the AN flare. Tighten to snug plus a quarter-turn; do not over-torque.
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FAQ
Do I need thread sealant on both sides?
No. Use Teflon thread sealant on the NPT side only. The AN side seals via a 37° metal-to-metal flare.
Can I use these with PTFE braided hose?
Yes. These adapters connect NPT ports to AN hose ends, including PTFE AN hose systems.
