370-04-BLK -4 Male to 1/8" NPT Female

Speedflow 370-04-BLK | -4 AN Male to 1/8" NPT Female Adapter | Black

The Speedflow 370-04-BLK is a precision-machined -4 AN male to 1/8" NPT female adapter in black anodised finish, designed to connect -4 AN braided line systems to components with a 1/8" NPT (National Pipe Taper) female port. Offering greater flow capacity than the -3 AN SF370-03-BLK variant, the 370-04-BLK is the preferred choice for oil, fuel, turbo, and hydraulic applications where -4 AN line systems interface with 1/8" NPT ported components.

Product Specifications

• Part Number: 370-04-BLK
• AN End: -4 AN male
• NPT End: 1/8" NPT female
• Finish: Black anodised
• Series: Speedflow 370 — AN Male to NPT Female Adapters
• Compatible With: Standard -4 AN male hose ends and 1/8" NPT male ports
• Barcode: 9342122011719

Applications

The 370-04-BLK is a versatile adapter for connecting -4 AN braided lines to NPT-ported components across a wide range of performance builds, including:

• Turbo oil feed line connections to 1/8" NPT ported turbocharger centre sections
• Oil pressure gauge and sensor line connections
• Engine oil and coolant line connections to NPT-ported components
• Fuel pressure gauge and regulator connections
• Hydraulic line connections to 1/8" NPT ported valves and sensors
• Any application requiring a -4 AN to 1/8" NPT interface in a performance or race build

370-04 vs 370-03 — Choosing the Right Size

The Speedflow 370 series AN to NPT adapters are available in both -3 AN (SF370-03-BLK) and -4 AN (370-04-BLK) configurations. The -4 AN variant provides a larger internal bore for increased fluid flow, making it the better choice for turbo oil feeds, fuel lines, and other high-flow applications. For lower-flow applications such as oil pressure sensors and gauge lines, the -3 AN SF370-03-BLK is typically sufficient.

AN to NPT — Installation Note

NPT fittings use a tapered thread that seals via thread interference. Always apply appropriate thread sealant or PTFE tape to the NPT threads during installation to ensure a leak-free seal. The black anodised finish delivers a premium aesthetic suited to show-quality and race builds alike.

Sold individually. Compatible with standard -4 AN male hose ends and 1/8" NPT male ports.