115mm Billet 12AN Offset Turbo Drain Flange for 2nd Gen Cummins Turbo Swaps
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Running a turbo swap kit on a 2nd gen Cummins with the turbine housing clocked in a way that leaves no clean path for the oil drain? This 115mm billet 12AN offset turbo drain flange is made for exactly that. The offset drain body moves the outlet away from the drain pad so you can route the return line where it actually fits.
Features & Benefits
- Made for 2nd gen Cummins swap kits — designed for turbo swaps where the turbine housing clocking makes drain routing difficult with a standard straight drain.
- Offset drain body — the outlet is offset from the flange instead of running straight out from the drain pad, giving the return line a workable path around the clocked housing.
- 115mm (4.53") drain length — the length of the drain, meaning how far the drain body stands off the flange face.
- Mid-frame and large-frame fit — machined for mid-frame turbos at a 50mm (1.97") bolt centre and large-frame turbos at 50.8mm (2.00"). Measure with calipers, as mid and large frame sit only about 1/32" apart.
- 12AN male port — connects directly to braided or hard-line -12AN oil return setups for full oil return back to the sump.
- Billet construction — machined from solid billet stock for strength and a precision sealing face that cast alternatives can't match.
- Bolts not included — 100mm and longer drains ship without mounting hardware. Supply bolts to suit your turbo's drain pad.
- Designed and made in Canada — manufactured by BSI Inc. and shipped to builders across North America, with CAD pricing.
If your housing clocking leaves a clear drop to the sump, one of our standard 12AN drains in 35mm, 65mm or 100mm is the simpler choice. See the S400 Turbo Oil Drain Guide for bolt centre measurement, length selection, and sizing charts, or send us your build through the Turbo Spec Form if you're unsure.
FAQ
What is this drain flange for?
It is made for 2nd gen Cummins turbo swap kits where the turbine housing is clocked in a way that makes oil drain routing difficult.
What does offset mean?
The drain outlet is offset from the flange rather than running straight out from the drain pad, which gives the return line a workable path around a clocked turbine housing.
Which turbos does it fit?
Mid-frame turbos with a 50mm (1.97") bolt centre and large-frame turbos with a 50.8mm (2.00") bolt centre.
What does the 115mm refer to?
115mm (4.53") is the length of the drain, meaning how far the drain body stands off the flange face. It is not the bolt centre or the port size.
Do I need this drain for my build?
Only if your turbine housing clocking makes a standard straight drain hard to route. Otherwise, one of our standard 35mm, 65mm or 100mm 12AN drains is the simpler fit.
Are bolts included?
No. 100mm and longer drains ship without mounting hardware, so supply bolts to suit your turbo's drain pad.
What is bolt centre?
Bolt centre is the distance from the centre of one bolt hole to the centre of the other on your turbo's oil drain pad. It identifies the frame class: 38mm (1.50") small frame, 50mm (1.97") mid frame, 50.8mm (2.00") large frame.
What oil return setup does the port fit?
The 12AN male port connects directly to braided or hard-line -12AN oil return setups.
Where is this turbo drain flange made?
It is designed and made in Canada by BSI Inc. and shipped to builders across North America.