# MRC4025341-13B Cummins 5.9L B Series Aftercooler Service Kit (B) O-ring Kit MRC4025341-13B

**O-Ring Service Kit**

Cummins 5.9L BTA Aftercooler Service Kit (A) O-ring kit

Used on Aftercooler Assembly - 3979771 / 5566841

Non OEM Mr Cool Replacement product P/N MRC4025341-13B

**Kit includes**

4 x O-rings (only 2 needed. 2 different thicknesses provided)

1 x Gasket

1 x METALUBE / Brush

This is a Mr Cool (USA) Replacement Part MRC4025341-13B.

## Details

- **Price:** 352.0 AUD
- **Vendor:** Mr Cool
- **Tags:** Sawley’s AAM Aftermarket – Cooling Systems Mr Cool | Marine Heat Exchangers & Kits

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 352.00 AUD | In stock |

## Images

- MRC4025341-13B Cummins 5.9L B Series Aftercooler Service Kit (B) O-ring Kit MRC4025341-13B

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/mrc4025341-13b-cummins-5-9l-b-series-aftercooler-service-kit-b-o-ring-kit-mrc4025341-13b)
> Updated: 2026-06-23