SKU: FRG495021-BL
UPC: 822320022568
MPN: 495021-BL
The FRAGOLA #4 Male x 1/8 female pipe thread gauge adapter provides a clean inline solution for adding pressure monitoring to AN-plumbed fluid systems. Built for racers, builders, and enthusiasts who need accurate readings from their fuel, oil, or coolant circuits, this fitting threads directly into existing -4 AN lines without requiring bulky tee fittings or flow-disrupting configurations. The 1/8 female pipe thread port accepts standard mechanical or electronic pressure senders, making it a practical choice for anyone upgrading their instrumentation setup.
FRAGOLA machines this adapter from high-strength aluminum with a black anodized finish that resists corrosion and withstands the chemical exposure common in fuel and lubricant applications. The -4 AN male end features precision-cut 37-degree flare seating surfaces for leak-free connections under pressure and vibration. At approximately 1 inch in overall length, the compact profile allows installation in tight engine bay locations without adding unnecessary bulk to plumbing runs. The female pipe thread port is tapped to standard 1/8-27 dimensions, ensuring compatibility with gauges and senders from most aftermarket manufacturers. Browse our complete selection of adapter fittings and AN components for additional plumbing options.
Install this gauge adapter anywhere you need inline pressure monitoring—fuel rails, oil feed lines, turbo oil supply circuits, or transmission cooler plumbing. The inline design maintains smooth flow characteristics compared to 90-degree or tee-style gauge ports. Pair it with matching -4 AN unions and performance hose assemblies from our fittings and hoses department to complete your installation. We stock FRAGOLA components for builders who demand reliable hardware in demanding applications.
This adapter accepts any pressure sender or gauge with a 1/8-27 male pipe thread, which is the most common size for automotive pressure senders. Most aftermarket oil pressure, fuel pressure, and boost senders use this thread pitch, including popular units from Auto Meter, AEM, and Innovate.
Yes, the aluminum construction and anodized finish are compatible with gasoline, E85, methanol, and diesel fuels. The -4 AN size is commonly used in fuel system plumbing, making this adapter well-suited for inline fuel pressure gauge installations on EFI conversions and performance builds.
The inline design maintains the internal diameter of standard -4 AN fittings, minimizing flow restriction compared to tee-style gauge adapters. For most fuel and oil pressure applications, the flow difference is negligible and will not affect system performance.
The AN male end seals via the 37-degree flare and does not require sealant. The 1/8 female pipe thread port should use appropriate thread sealant or PTFE tape on the male sender threads to prevent leaks, as pipe threads rely on interference fit rather than mechanical sealing.
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