# 991970 Nipple | Genuine Volvo Penta Part

## 🔧 Product Description

Genuine Volvo Penta nipple weighing 0.091 kg and listed for a single application on the TWD series. That one-application TWD fitment is what identifies it: the reverse-gear nipple 991057 carries exactly the same 0.091 kg published weight across 46 D-series applications, so weight is no guide between them.

## 🚤 Compatibility

Typically suits:

-   Volvo Penta TWD1643GE

-   **Engine Family:** TWD

## ⚙️ Key Features

-   0.091 kg
-   One application on the TWD series
-   Same published weight as the reverse-gear nipple 991057 — order by number
-   No published thread size

## 🔌 Function

Forms a threaded union between a line and its port so fluid can pass from one to the other without leaking.

## ⚠️ Common Signs of Failure

-   Weeping, misting or dripping at the union
-   Thread damaged, cross-started or corroded
-   Sealing taper or cone face nicked or scored
-   Nipple cracked or split at the hex

## 🛠️ Service Notes

-   Confirm the engine is a TWD before ordering — this nipple and 991057 are published at the same weight and differ only in application

## 📦 Condition

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

## Details

- **Price:** 24.18 AUD
- **Vendor:** Volvo Penta
- **Type:** Hoses & Pipes
- **Tags:** Volvo Penta

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 24.18 AUD | In stock |

## Images

- 991970 Nipple | Genuine Volvo Penta Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/991970-nipple-genuine-volvo-penta)
> Updated: 2026-10-08