I put this in line with my oil cooler so I could get a oil pressure reading there. This worked great as a way to tap into the 6AN oil line. The fitting worked as designed and seems to be of good quality.

The 6AN Female to 4AN Male Flare Reducer Adapter is a high-quality, versatile fitting designed for use in automotive fluid systems, particularly for fuel, oil, or coolant lines. This adapter is engineered to reduce the size of a 6AN female thread to a 4AN male thread, making it an ideal solution for users who need to connect parts with different AN fitting sizes. Below is a detailed review of its features, performance, and value.1. Design and Build QualityAluminum Construction: The 6AN Female to 4AN Male Flare Reducer Adapter is made from durable aluminum, which is both lightweight and strong. Aluminum is an excellent material for automotive fittings due to its corrosion resistance and ability to withstand high pressure and temperature. This ensures the adapter will perform reliably over time, even in harsh environments.Black Anodized Finish: The adapter features a black anodized finish, which not only enhances its aesthetic appeal but also adds a layer of protection against corrosion, scratches, and wear. This makes it especially well-suited for automotive applications where parts are exposed to varying weather conditions and potential abrasive surfaces.Precision Machining: The fitting is carefully machined to ensure that the threads on both ends (6AN female and 4AN male) align correctly and provide a secure, leak-free connection. This precise machining ensures a perfect fit, preventing any leakage and ensuring the system operates effectively.2. Compatibility and ApplicationFlare Reducer: This adapter is designed to reduce a 6AN fitting (9/16"-18 thread) to a 4AN fitting (7/16"-20 thread). It is commonly used in applications where you need to adapt larger fittings to smaller ones, making it ideal for fuel, oil, or coolant systems in performance vehicles or custom builds.Wide Application: The adapter is suitable for a variety of systems, including fuel lines, oil lines, coolant systems, and transmission cooler lines. It can be used in race cars, custom engine builds, and street vehicles where precise fluid routing is essential. This fitting is also beneficial when working with braided hoses or rigid lines in applications requiring different AN sizes.Versatile Use: Whether you’re building a new custom system or adapting an existing one, this fitting allows for seamless integration of different-sized hoses or parts, ensuring flexibility and reducing the need for multiple, different fittings.3. Performance and FunctionalityLeak-Proof Seal: The flare connection design of the adapter ensures that it forms a tight, leak-proof seal when connected to hoses or fittings, which is crucial in high-pressure systems. The anodized aluminum and precise threading work together to prevent leaks that could compromise the performance of the fluid system.Fluid Flow Efficiency: The smooth internal structure of the fitting ensures there are no significant restrictions in fluid flow, which is critical in high-performance applications like racing engines or heavy-duty cooling systems. The adapter helps maintain optimal flow without introducing turbulence, which could affect system performance.High-Pressure and High-Temperature Resistance: The materials used in this adapter ensure that it can withstand high-pressure and high-temperature conditions typically seen in automotive applications, ensuring reliable performance even under demanding driving conditions or extended use.4. Ease of InstallationSimple Installation Process: The 6AN Female to 4AN Male Flare Reducer Adapter is straightforward to install, requiring no special tools beyond basic wrenches or an adjustable spanner. The flare fittings are designed for easy connection and disconnection, making this adapter ideal for those working on custom fluid systems or doing repairs.No Special Tools Required: Most users will find that they can install this adapter with standard hand tools. The flare fittings ensure a secure connection, so there is no need for additional seals or gaskets, reducing installation time and complexity.5. Customer FeedbackPositive Reviews: Many users have praised the 6AN to 4AN Flare Reducer Adapter for its quality construction, precision fit, and easy installation. Customers appreciate the black anodized finish, which not only looks professional but also provides added durability. The adapter is often highlighted for maintaining a leak-free connection, even in high-pressure systems.Minor Critiques: Some users have pointed out that it’s essential to check the specific size requirements before purchasing, as the 6AN to 4AN reduction might not be suitable for every application. It’s a good practice to ensure that the reduced size matches the size of your hoses or system components before installation.6. Value for MoneyAffordable and Reliable: The 6AN Female to 4AN Male Flare Reducer Adapter offers excellent value for money, providing a reliable, durable solution for adapting different-sized AN fittings without needing to replace or reconfigure other components in the system. For the price, it provides good build quality and performance for automotive and performance applications.Long-Term Durability: The use of aluminum and the anodized finish ensures that this adapter will provide long-lasting durability, even in high-stress environments. The corrosion resistance and precision fit make this adapter a smart investment for anyone building or upgrading a custom fluid system.ConclusionThe 6AN Female to 4AN Male Flare Reducer Adapter is a high-quality, reliable, and affordable solution for reducing the size of AN fittings in automotive fluid systems. With its aluminum construction, black anodized finish, and precise machining, it provides a secure, leak-proof connection and ensures optimal fluid flow. This adapter is ideal for fuel lines, oil lines, coolant systems, and more, making it a great choice for performance vehicles, custom builds, and engineers who need a versatile and durable solution for adapting different-sized AN fittings.Overall, this adapter provides great value, offering reliable performance, easy installation, and long-term durability, making it a smart choice for automotive enthusiasts and professionals looking to adapt or upgrade their fluid systems.