# 21662704 Vacuum Valve | Genuine Volvo Penta Part

## 🔧 Product Description

Genuine Volvo Penta vacuum valve for 25 mm hose - the largest of the four sizes listed. A vacuum valve should be fitted on any vessel whose engine installation sits at or below the waterline: it prevents siphonage through the seawater intake and the water ingress to the engine that follows. It weighs 0.084 kg, the same published figure as the 22 mm valve 21662703, and is listed for 12 applications across the D2-50, D2-55, D2-60 and D2-75 range.

## 🚤 Compatibility

Typically suits:

-   Volvo Penta D2-55
-   Volvo Penta D2-55B
-   Volvo Penta D2-55C
-   Volvo Penta D2-55D
-   Volvo Penta D2-55E
-   Volvo Penta D2-55F
-   Volvo Penta D2-50F
-   Volvo Penta D2-75
-   Volvo Penta D2-75B
-   Volvo Penta D2-75C
-   Volvo Penta D2-75F
-   Volvo Penta D2-60F

-   **Engine Family:** D
-   **HP Range:** 50-75 HP

## ⚙️ Key Features

-   For 25 mm hose - the largest of the four sizes
-   Fitted where the engine installation is at or below the waterline
-   Prevents siphonage through the seawater intake
-   0.084 kg, the same as the 22 mm valve
-   12 applications across the D2 range
-   Sized by cooling hose diameter
-   Hose diameter: 25 mm
-   Fits: Seawater cooling circuits on installations at or below the water line

## 🔌 Function

Admits air when the engine stops, breaking the siphon that could otherwise flood the exhaust manifold and cylinders with seawater.

## ⚠️ Common Signs of Failure

-   Seawater leaking or dripping from the valve
-   Valve blocked by salt crystals or debris
-   Water siphoning into the exhaust after shutdown
-   Valve element sticking so it will not admit air
-   Cracked housing or hose connection

## 🛠️ Service Notes

-   This valve and the 22 mm valve 21662703 share a published weight, so order by the hose diameter
-   Mount the valve at the high point of the seawater circuit, above the waterline, and check the element is clear of salt at each service
-   Fit one wherever the engine installation sits at or below the water line
-   Hose diameter is the whole of the selection - 16, 19, 22 and 25 mm are listed

## 🔄 Supersession & Cross Reference

### OEM Supersession Chain

-   21662704 → Supersedes 3583738

### OEM / Related Numbers

-   3843297 earlier number superseded by this part
-   3583738 earlier number superseded by this part

### Other-Brand OEM Numbers

-   Johnson Pump 09-47316-05

### Aftermarket / Verified Equivalents

-   Albin Pump Marine 05-69-037

## 📦 Condition

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

## Details

- **Price:** 256.73 AUD
- **Vendor:** Volvo Penta
- **Type:** Cooling System
- **Tags:** Volvo Penta

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 256.73 AUD | In stock |

## Images

- 21662704 Vacuum Valve | Genuine Volvo Penta Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/21662704-vacuum-valve-genuine-volvo-penta)
> Updated: 2026-10-10