# 21596908 Combined Tank Unit | Genuine Volvo Penta Part

## 🔧 Product Description

Combined DEF/AdBlue tank unit used in a Volvo Penta SCR aftertreatment installation. The assembly integrates the tank-related supply and level/temperature functions for the emissions system; later service listings use replacement reference 24669276.

## ⚙️ Key Features

-   Genuine Volvo Penta combined DEF tank unit
-   Integrated SCR reductant storage and tank-service functions
-   Later OEM replacement reference 24669276
-   Designed for the matching pump, lines, sensors and control system
-   Application must be matched by engine product and serial number
-   Engine type: Volvo Penta diesel engine equipped with SCR exhaust aftertreatment

## 🔌 Function

Stores and supplies diesel exhaust fluid to the SCR dosing system while providing the tank-related level/temperature information required by the controller.

## ⚠️ Common Signs of Failure

-   Low-level or tank-sensor fault codes with adequate DEF present
-   SCR derate or inducement warning
-   DEF leakage, crystallisation or contamination
-   No DEF supply to the dosing system
-   Incorrect tank temperature or level indication

## 🛠️ Service Notes

-   It supersedes 21073824, and a later parts listing also carries reference 24669276 for the same tank unit — check under both numbers if a current search comes up empty
-   This unit combines the DEF supply with the tank's level/temperature sensing, so treat the sender wiring and connector as part of the same job whenever the tank itself is disturbed

## 🔄 Supersession & Cross Reference

### OEM Supersession Chain

-   21596908 → Supersedes 21073824

### OEM / Related Numbers

-   20812622 related DEF tank reference
-   21073824 related DEF tank reference
-   7420812622 related cross-reference
-   7421073824 related cross-reference
-   7421244989 related cross-reference

## 📦 Condition

-   Genuine Volvo Penta part
-   Brand new
-   Supplied in original or equivalent packaging

## Details

- **Price:** 1537.24 AUD
- **Vendor:** Volvo Penta
- **Type:** Inlet & Exhaust
- **Tags:** Volvo Penta

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 1537.24 AUD | In stock |

## Images

- 21596908 Combined Tank Unit | Genuine Volvo Penta Part
- 21596908 Combined Tank Unit | Genuine Volvo Penta Part - photo 2 of 2

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/21596908-combined-tank-unit-genuine-volvo-penta)
> Updated: 2026-10-10