# 78458A1 Mercury MerCruiser Bellows Kit | Genuine Quicksilver OEM Part

🔧 Product Description

  

Genuine Quicksilver Exhaust Tube Assembly - Part Number: 78458A1

  

Genuine Quicksilver/MerCruiser exhaust tube assembly for MerCruiser Bravo stern drive applications. Although commonly described as a bellows-style exhaust service part, this component is the exhaust tube assembly used in place of the full exhaust bellows on compatible Bravo I, Bravo II and Bravo III drive installations.

  

⚙️ Key Features

  

• Genuine Quicksilver/MerCruiser OEM exhaust tube assembly

• Used on compatible Bravo stern drive exhaust outlets

• Direct replacement for 78458 and 78458A1 references

• Helps direct exhaust discharge through the drive area

• Easier service-style exhaust tube design compared with full bellows installation

  

🔄 Supersession & Cross Reference

  

OEM Supersession Chain:

  

• 78458A1 → Supersedes 78458

• 78458 earlier OEM reference

  

OEM / Related Numbers:

  

• 78458A1

• 78458

• 78458A 1

• Exhaust tube assembly

• Exhaust tube bellows replacement reference

  

Aftermarket / Verified Equivalents:

  

• Sierra: 18-2756

• GLM: 89180

• CEF: exhaust tube bellows equivalent

• REC: REC78458A1

  

🚤 Compatibility

  

Commonly used on:

  

• MerCruiser Bravo stern drive exhaust tube applications

• MerCruiser Bravo I, Bravo II and Bravo III exhaust outlet service

• MerCruiser Alpha / Bravo-style exhaust service where 78458A1 is specified by parts diagram

  

Typically suits:

  

• Engine models:

• MerCruiser Bravo One stern drives

• MerCruiser Bravo Two stern drives

• MerCruiser Bravo Three stern drives

• MerCruiser Bravo transom assemblies using exhaust tube 78458A1

• MerCruiser stern drive applications where the exhaust tube assembly is specified instead of full exhaust bellows

  

• HP Range: Not applicable - stern drive exhaust tube component

• Engine Type: MerCruiser Bravo stern drive exhaust outlet system

• Year Range: Application dependent by Bravo drive model, transom assembly and parts diagram

  

🔌 Function

  

The exhaust tube helps direct exhaust gases and cooling water discharge through the stern drive exhaust outlet area. It provides a shorter open exhaust connection compared with a fully sealed exhaust bellows arrangement and is commonly used on Bravo drive service applications.

  

Common signs of failure:

  

• Cracked, split or hardened exhaust tube

• Exhaust noise increase around the transom area

• Exhaust discharge not directed correctly

• Tube slipping from the mounting lip

• Damage found during transom or bellows service

• Rubber deterioration from heat and age

  

📦 Condition

  

• Genuine Quicksilver part

• Brand new

• Supplied in original or equivalent packaging

## Details

- **Price:** 103.8 AUD
- **Vendor:** Quicksilver
- **Tags:** Quicksilver Marine Parts | Oils Service Kits & Engine Components

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 103.80 AUD | In stock |

## Images

- 78458A1 Mercury MerCruiser Bellows Kit | Genuine Quicksilver OEM Part

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> Source: [Sawley's Auto and Marine](www.sawleysautoandmarine.com.au/products/78458a1-mercury-mercruiser-bellows-kit-genuine-quicksilver-oem-part)
> Updated: 2026-05-17