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FleetPro Parts

Cummins Expansion Plug - 3905368

Cummins Expansion Plug - 3905368

Regular price $6.44 USD
Regular price $11.30 USD Sale price $6.44 USD
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Orders are typically processed within 24–48 hours, Monday through Friday, excluding major U.S. holidays. Shipping options include Small Package Saver, Ground, Second Day Air, and Next Day Air. Free Shipping applies to qualifying items within the contiguous 48 states. Freight or oversized shipments require a commercial address. Please inspect all deliveries and report damages within 24–48 hours. We ship only within the continental U.S. and cannot deliver to P.O. boxes or international locations. Most orders ship from our North Carolina warehouse. For estimated transit times, see the shipping chart. Read more information.

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Expert-selected truck parts

At FleetPro Parts, we specialize in supplying OEM replacement parts for heavy-duty trucks. From Freightliner and Detroit Diesel to Cummins, Mack, Volvo, and Wabco, our catalog covers the components you need to keep your fleet moving. Every part we stock is tested, reliable, and built to match OEM standards, so you can order with confidence. Our team knows truck parts inside out—from engine cooling and steering to AC systems, alternators, and fuel components. Whether you’re maintaining a single truck or managing an entire fleet, we make it easy to find the right part, at the right time. For when it matters. More about Us.

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FleetPro Truck Center Inc • 4989 Hendersonville Rd, Fletcher, NC 28732 • Phone +1 888-722-1331

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Description:

The Cummins Expansion Plug 3905368 is a genuine OEM block plug designed to seal service openings or freeze-plugs in Cummins engines, especially the ISB/QSB 6.7L series. It ensures that coolant, oil or other fluids do not escape the engine block, maintaining system integrity. It is a small but vital engine component, using the correct plug helps prevent leaks, engine damage and downtime.

Features:

Part#: 3905368
Application / Fitment: Used in Cummins ISB / QSB 6.7L engines (and potentially other Cummins industrial blocks)
Function: Expansion plug / freeze-plug / block plug – seals an unused or service hole in engine block or other casting
Material / Construction: Steel or metallic material in aftermarket listing: e.g., “0.385” OD x .0490” Thk x 0.037” Depth” steel plug
Dimensions: 0.385” (9.78mm) OD × 0.490” (12.45mm) depth × 0.037” (0.94mm) thickness

Part# : 3905368
Brand: Cummins