AN Male to Female Tee Fittings

Q: What's the actual male/female layout on this tee: which side is which?

The two ends on the straight-through run are male AN flare fittings, built to connect into your existing fuel or oil line. The side branch is a female AN swivel port — the new connection point for a gauge, sensor, or secondary line. The swivel lets you rotate the branch before final tightening, so you're not locked into one fixed angle.

Q: Can I get this tee with different AN sizes on the run versus the branch?

Not within this collection — every port on a given AN tee fitting (both run ends and the branch) is the same AN size. If you need a smaller line off the branch, such as a -6AN gauge line tapped off an -8AN run, add a separate AN reducer fitting to the branch port rather than looking for a mixed-size tee.

Q: What sizes are available, and how do I know which AN size to order?

Sizes run from 4AN up to 16AN depending on the finish you choose (16AN is currently only available in the black version). Match the tee to the AN size of the hose or hard line you're already running — check the fitting stamped on your current hose end, or the spec sheet for your fuel line kit, if you're not sure. Going up or down a size to "fit better" usually just moves the leak point somewhere else.

Every fuel or oil line eventually needs a third connection — a pressure gauge, a flex-fuel sensor, a return line, a catch can vent — and cutting a fresh line into a system that's already routed is never as clean as you'd like.

Evil Energy AN male to female tee fittings solve that with one part instead of three. Two male AN flare ends carry your existing line straight through, while a female swivel branch on the side gives you a ready-made take-off point — the same job a hardware-store fuel line splitter claims to do, but built and sealed to real AN hose fitting spec instead of guessed at.

Why This Tee Doesn't Become the Leak You're Trying to Avoid

A tee is only as good as the ports on it, and that's where most "universal" splitters cut corners. Every Evil Energy AN tee fitting is machined from 6061-T6 aluminum and seals metal-to-metal on a 37° AN flare — no thread sealant, no crush washer, no O-ring to age out under heat. That matters most on fuel lines specifically, where a slow leak is never just a cosmetic problem.

360° female swivel branch: the side port rotates freely before you tighten it down, so you can aim the branch exactly where it needs to go without twisting the hose or fighting for clearance.
One fitting instead of two or three stacked adapters: fewer threaded joints means fewer places to leak, and a lot less bulk when space behind a fuel rail or inside an engine bay is already tight.
4AN to 16AN sizing: matched to the same AN hose fittings you're already running, from small EFI returns to full-size fuel cell feeds.
Black or Red & Black anodized finish: corrosion-resistant and rated for gasoline, diesel, E85, oil, and coolant, not just fuel.

Where a Tee Belongs in Your Routing — and Where It Doesn't

The best use for an AN tee fitting is tapping a signal or secondary line off a system that's already flowing correctly: a fuel pressure regulator reference port, a flex-fuel sensor sample line, a return line branch, or a coolant temp probe bung. Used that way, it cleans up routing and removes two adapters' worth of leak points in one shot.

What it's not built for is feeding two engines, two carburetors, or two fuel rails off a single dead-headed line — a simple tee has no way to balance flow between branches, so one side can end up starving while the other pulls more than its share. For that job, step up to a Y-block fitting, or run both branches off a dedicated fuel filter with multiple outlets instead.

Port Layout at a Glance

Port	Gender	Typical Use
Run (both ends)	Male AN flare	Connects into your existing fuel/oil line, in-line with flow
Branch (side)	Female AN swivel	New take-off point for a gauge, sensor, or secondary line

All three ports on a given tee share the same AN size — there's no mixed-size option within this collection. If your branch line needs to step down (say, an -8AN run feeding a -6AN gauge line), add a separate AN reducer fitting to the branch rather than looking for a mixed-size tee.

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FAQs about AN Male to Female Tee Fittings

What's the actual male/female layout on this tee: which side is which?

The two ends on the straight-through run are male AN flare fittings, built to connect into your existing fuel or oil line. The side branch is a female AN swivel port — the new connection point for a gauge, sensor, or secondary line. The swivel lets you rotate the branch before final tightening, so you're not locked into one fixed angle.

Can I get this tee with different AN sizes on the run versus the branch?

Not within this collection — every port on a given AN tee fitting (both run ends and the branch) is the same AN size. If you need a smaller line off the branch, such as a -6AN gauge line tapped off an -8AN run, add a separate AN reducer fitting to the branch port rather than looking for a mixed-size tee.

Do I need thread sealant or tape on these fittings?

No. All three ports seal metal-to-metal on a 37° AN flare, so sealant, tape, or a crush washer isn't needed and can actually interfere with the seal. If you're adapting the branch to an NPT-threaded gauge or sensor with a separate adapter, use a fuel-rated sealant on that NPT connection only — not on the AN flare itself.

Can I use one of these to split a single fuel line and feed two engines, carburetors, or fuel rails?

We do not recommend this basic tee fitting. It cannot equalize fuel flow to the two outlets, causing uneven fuel delivery under load, which poses hazards for dual-engine and dual-fuel rail configurations.
For such setups, use a Y-block adapter or multi-port fuel filter for stable, balanced fuel distribution.
This tee is only suitable for branching auxiliary lines like pressure gauges, flex-fuel sensors or return lines from a properly functioning main fuel circuit.

What sizes are available, and how do I know which AN size to order?

Sizes run from 4AN up to 16AN depending on the finish you choose (16AN is currently only available in the black version). Match the tee to the AN size of the hose or hard line you're already running — check the fitting stamped on your current hose end, or the spec sheet for your fuel line kit, if you're not sure. Going up or down a size to "fit better" usually just moves the leak point somewhere else.

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AN Male to Female Tee Fittings

Why This Tee Doesn't Become the Leak You're Trying to Avoid

Where a Tee Belongs in Your Routing — and Where It Doesn't

Port Layout at a Glance

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AN Male to Female Tee Fittings

Why This Tee Doesn't Become the Leak You're Trying to Avoid

Where a Tee Belongs in Your Routing — and Where It Doesn't

Port Layout at a Glance

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