4an Tee 1/8 MPT On The Side - Black

The 4AN Tee 1/8 MPT On The Side - Black from FRAGOLA is a precision hydraulic or fuel line adapter engineered for custom automotive plumbing in high-performance engine bays, fuel systems, and brake line applications. As a seasoned mechanic, you'll recognize this component as essential when routing fluid lines around tight engine compartments or integrating auxiliary fuel rails, transmission coolers, and custom cooling circuits. This fitting allows you to branch a main line while maintaining a compact footprint—critical when space is premium in modified vehicles.

Constructed from aluminum with a black anodized finish, the 4AN Tee 1/8 MPT On The Side delivers corrosion resistance and a clean aesthetic under the hood. The design features a 4AN port (standard -4 AN line size used in fuel systems and cooling loops) as the main inlet/outlet, with a 1/8 inch male pipe thread (MPT) side port for gauges, sensors, or auxiliary line connections. The "on the side" configuration means the MPT branch emerges perpendicular to the primary 4AN flow path, enabling flexible line routing without sharp bends that could restrict flow or weaken hose durability.

This adapter is ideal for builders integrating fuel pressure gauges, secondary fuel injector rails, boost-referenced fuel regulators, or auxiliary cooler circuits into turbocharged, supercharged, or naturally aspirated performance builds. The modest 0.03 lb weight and compact 2.3 × 0.7 × 4 inch profile make it simple to position in cramped engine bays without requiring extensive bracket fabrication. Verify 1/8 MPT thread compatibility with your sensor or line fittings, and ensure all connections are sealed with appropriate thread sealant to prevent fluid leaks under pressure.