The AN16 version of this tee handles the largest lines in the range, with male 37° flares on the straight run and a rotating female swivel on the branch. It is intended for serious volume work — dry-sump tank and scavenge plumbing, large cooler transfers, and high-capacity fuel suction and return circuits — where three big hoses have to meet at one point. The swivel branch is close to a necessity at this size, since AN16 hose has almost no give and cannot be wound into alignment. Mount the tee to structure rather than leaving it suspended, and check clearance for spanners on all three hex flats before committing.