Cummins NEW OEM O-Ring Seal 3685124 NOS ISX QSX ISB XPI (LOT OF 2) 0810

Cummins OEM O-Ring Seal — Part Number 3685124
Brand: Cummins | Condition: New Old Stock (NOS)

You are purchasing a genuine Cummins OEM O-Ring Seal, part number 3685124. This is an authentic factory original part — never installed, never used.

Specifications:

• Cross Section: 0.139" (3.53mm)
• Inner Diameter: 2.609" (66.27mm)
• Material: Viton 75
• Series: #-231

Condition Details:

This is a New Old Stock (NOS) part. The O-ring seal itself is in new, uninstalled condition. As is common with NOS inventory, the original packaging may show signs of age, including shelf wear, dust, or minor cosmetic blemishes on the bag or box. The part is new and fully functional.

Part Number / Supersede Information:

Primary OEM Part Number: 3685124
Caterpillar Cross-Reference: 101-3953, 6J2244
Aftermarket Cross-Reference: Interstate-McBee M-3685124 | PAI 121424

This part number may have been superseded or cross-referenced by an updated Cummins part number. We recommend verifying any current supersede numbers through your local Cummins dealer or the official Cummins parts catalog prior to ordering.

Fitment Notes:

• Used primarily on XPI fuel systems on EPA13 Automotive 15-liter ISX / QSX engines
• Also compatible with: ISB5.9 CM2880, ISX12 CM2350, ISX12/ISX11.9 CM2250, B5.6 CM2670 series engines
• Please verify fitment using your engine's model and serial number before ordering

Why Choose OEM Parts?

OEM parts are engineered and manufactured to exact factory tolerances, ensuring a precise fit, reliable performance, and long service life. Unlike aftermarket alternatives, OEM parts are designed specifically for your Cummins engine — no modifications, no guesswork.

Returns:

We proudly offer hassle-free returns. If you are not completely satisfied with your purchase for any reason, simply open a return request through eBay within 30 days of purchase and we will take care of you promptly.

Thank you for choosing QBS Parts Inc! We truly appreciate your business. If you have any issues whatsoever with your order, please give us the opportunity to resolve it before leaving feedback — we are committed to making every transaction a great experience. Please verify fitment using your engine's model and serial number before purchasing. Feel free to message us with any questions — we're here to help!

QBS Parts, Inc. — Gardena, CA