#4 Flare #3 Flare Union Black

The AEROQUIP #4 Flare #3 Flare Union Black (FCM5048) is a precision straight adapter fitting designed to connect AN-standard fittings with different port sizes. This aluminum adapter reduces a 4 AN male port to a 3 AN male configuration, making it essential for applications where port consolidation or step-down fitting is required.

Constructed from aluminum and finished in black anodized coating, this fitting provides corrosion resistance suitable for diverse operating environments. The flare-to-flare design ensures reliable leak-free connections when properly seated with compatible hoses and adapters. The lightweight design—weighing just 0.04 lbs—minimizes system weight while maintaining full pressure-rated performance.

This adapter serves applications in automotive cooling systems, mobile hydraulics, and industrial machinery where AN-standard connections are standard. Technicians and system builders choose downsizing adapters like the FCM5048 when consolidating multiple smaller lines into a single larger feed or return line, or when integrating components with mismatched port sizes.