Engines and Components› Oiling Systems

SEALED POWER

O-RING

$16.33

SKU: S03T FP-3678786

Special Order
Special Order
Ships in 4–6 weeks
Free Shipping
Non-Returnable Item
INSTALL DIFFICULTY
DIY PRO SHOP

Easy — 1–2 hours

Description

The Cummins 3678786 O-ring Seal is a replacement part designed for use in EPA13 6.7-liter ISB/QSB engines. This O-ring provides a compact and flexible sealing solution for static circular grooves within engine assemblies. It is essential for preventing fluid or gas escape from critical sealing points, ensuring system integrity.

MJ GASKET, the manufacturer, specializes in aftermarket gasket solutions for commercial and heavy-duty diesel engines, offering quality products manufactured in Taiwan.

Fitment

Fitment Guaranteed

Don’t gamble
on fit.

Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.

Available on iOS & Android

Specifications

BrandSEALED POWER
Part NumberS03T FP-3678786

Buy with Confidence

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

View Full Return Policy