True AN-spec Tee fittings are only available with all male ends or non-swivel female ends that require an O-ring seal. They are great for some applications, but the rest of us end up stacking adapters and female-to-female unions to get where we need to go.
This special motorsport Tee fitting has 6AN (9/16-18, 37° concave flare) female swivels on all three ends to accept standard 6AN male fittings. The swivel nuts allow you to tighten the fitting without turning the sealing seat, preventing flare damage. Black anodized aluminum. Sold individually.