Built for the bigger plumbing, this union joins an AN8 male flare to an AN8 female swivel with a 1/8″ NPT female branch machined between them. AN8 lines usually carry main fuel supply on high-output engines, oil cooler circuits and remote filter feeds, and the side port gives you a clean spot for a pressure sender or temperature sensor part-way along the run. The larger body means the small NPT branch barely disturbs flow. Standard 37-degree AN seats mate with any AN8 hose end or adapter, and the swivelling female end lets you aim the sender clear of headers and belts. Use a fuel-compatible sealant on the tapered port thread.