Cummins NEW OEM Thermostat Seal 3084879 NOS ISX QSX ISB N14 L10 EPA07 0810

Cummins OEM Engine Coolant Thermostat Seal — Part Number 3084879
Brand: Cummins | Condition: New Old Stock (NOS)

You are purchasing a genuine Cummins OEM Engine Coolant Thermostat Seal, part number 3084879. This is an authentic factory original part — never installed, never used.

Specifications:

• Free ID: 2.272" (57.7mm)
• OD: 2.661" (67.58mm)
• Width: 0.25" (6.35mm)

Condition Details:

This is a New Old Stock (NOS) part. The thermostat 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: 3084879
Also Referenced As: 135600, 186780, 111325
Aftermarket Cross-Reference: Interstate-McBee M-3084879

This part number may have been superseded or cross-referenced by an updated Cummins part number.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 EPA07 15-liter ISX / QSX engines
• Also fits: ISB / QSB, 855, N14, L10, and ISX12 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