This three-way tee has AN8 male 37-degree flare ports on all three legs and takes standard AN8 female hose ends throughout. AN8 is the usual step up when a single fuel feed has to serve a high-output engine or when oil cooler and remote filter circuits need branching, and this tee lets you split or merge those runs without dropping to a smaller passage. All ports being identical means you choose the flow direction to suit the layout. Support the fitting where practical, since two large hoses hanging off one tee put a fair load on the flares over time.