1/4in-1/8in Pipe Bushing

The 1/4in-1/8in pipe bushing (AEROQUIP FCM2136) is an essential hydraulic and pneumatic fitting for automotive technicians and performance builders who need reliable port adapters in fuel, oil, and air systems. This reducer bushing steps down from 1/4 inch NPT male threads to 1/8 inch NPT female threads, making it ideal for custom fuel rails, brake lines, turbo boost lines, and auxiliary cooling systems where space or existing manifold ports require a stepped connection. Whether you're fabricating a custom fuel system for a race engine or adapting OEM components to aftermarket manifolds, this bushing provides a leak-free transition between mismatched port sizes.

Manufactured by AEROQUIP under MPN FCM2136, this fitting features aluminum construction with blue anodized finish that resists corrosion in both fuel and coolant environments while providing visual identification in complex fuel or air systems. The blue anodized coating protects against oxidation and makes these fittings easily distinguishable on the workbench or under the hood, reducing installation errors. NPT (National Pipe Tapered) threads on both ends ensure a cone-seal fit that tightens progressively as you torque the fitting, eliminating the need for additional sealing tape or compound on properly prepared threads—a critical detail for fuel system integrity under pressure.

This adapter bushing is commonly used in LS engine conversions, turbo plumbing modifications, custom fuel system builds, and auxiliary system installations where port sizes don't align between components. The compact 2.3 x 1.1 x 3.75 inch footprint and minimal 0.02 lb weight make it ideal for tight engine bays and manifold configurations. When installing, ensure both male and female ports are clean and free of debris, apply moderate thread tension, and verify no cross-threading occurs—overtightening aluminum fittings against cast iron ports can strip threads, so hand-tighten first, then snug with appropriate wrenches.