Edelbrock/Russell 660810 Blue Anodized Aluminum -4AN 90-Degree Flare to 1/4" Pipe Adapter Fitting Precision machined to ensure accurate thread engagement Provides maximum protection against corrosion 37 degree sealing angle guarantees a positive seal at maximum operating pressures 90 degree -4 AN to 1/4" NPT (National Pipe Tapered) pipe size Has a blue anodized finish