---
product_id: 27656377
title: "T-20939 4\" Exhaust Manifold Riser Elbow Marine Power 0992-593 Sierra 18-1939 GLM 56140"
brand: "h2o performance parts"
price: "₨5245"
currency: SCR
in_stock: false
reviews_count: 1
url: https://www.desertcart.sc/products/27656377-t-20939-4-exhaust-manifold-riser-elbow-marine-power-0992
store_origin: SC
region: Seychelles
---

# Leak tested reliability Marine-grade quality CNC machined precision T-20939 4" Exhaust Manifold Riser Elbow Marine Power 0992-593 Sierra 18-1939 GLM 56140

**Brand:** h2o performance parts
**Price:** ₨5245
**Availability:** ❌ Out of Stock

## Summary

> 🚤 Elevate Your Marine Experience!

## Quick Answers

- **What is this?** T-20939 4" Exhaust Manifold Riser Elbow Marine Power 0992-593 Sierra 18-1939 GLM 56140 by h2o performance parts
- **How much does it cost?** ₨5245 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.sc](https://www.desertcart.sc/products/27656377-t-20939-4-exhaust-manifold-riser-elbow-marine-power-0992)

## Best For

- h2o performance parts enthusiasts

## Why This Product

- Trusted h2o performance parts brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Marine Ready:** Built to withstand the toughest marine conditions.
- • **Durable Design:** Shot peened for a smooth, long-lasting finish.
- • **High Performance:** Uniform wall thickness for optimal exhaust flow.
- • **Leak-Proof Assurance:** Factory leak tested to ensure reliability.
- • **Precision Engineering:** CNC machined for perfect gasket fit.

## Overview

The T-20939 4" Exhaust Manifold Riser Elbow is a high-quality replacement part designed for marine engines, ensuring optimal performance and durability. With precision CNC machining, a smooth shot-peened finish, and rigorous leak testing, this riser elbow is engineered to meet the demands of marine environments while providing a perfect fit for your engine.

## Description

DetailsReplaces: Marine Power Part# 0992-593, Barr Part# 20-0100, and Sierra 18-1939. Used in: Ford Small Block V8 302-351 cu.in., GM Small Block 305-350 cu.in and GM Big Block V8 454 cu.in.Mounting Hardware & Gasket not included About H20 Performance Parts   H2O has been a private label manufacturer of aftermarket exhaust manifolds, risers, elbows and spacers for the marine industry since 2010. In 2013 we launched our own brand, H20 Performance Parts, as an additional avenue to provide high-quality marine exhaust components at a cost-effective price. By combining the latest tooling and an innovative casting procedure, H2O manifolds are produced with uniform wall and water jacket thicknesses; resulting in exacting fit and performance while eliminating traditional leak points. The material used for each casting is a high-grade cast iron that is continually tested to ensure a consistent mix and melt and to provide structural integrity and strength. Every mounting surface on every manifold, riser and spacer is CNC machined to guarantee an excellent gasket mating surface. Every component is 100% leak tested and coated with a baked enamel surface before leaving our manufacturing facility to provide an high quality product that looks as good as it performs.   H2O Performance Part’s Warranty   All of our marine exhaust manifolds, risers, and exhaust connectors are warrantied against defects in workmanship and/or material to the original purchaser for a period of three years from the date of purchase, excluding commercial marine usage.

## Features

- Replaces Barr 20-0100 Marine Power 0992-593 Sierra 18-1939 GLM 56140
- High quality, uniform wall thickness, clean exhaust passages
- Shot peened for smooth external finish
- All mounting surfaces CNC machined to guarantee exacting gasket mating surface
- Leak tested and coated with a baked enamel from the factory

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Item Package Dimensions L x W x H | 14.6 x 7.6 x 5.8 inches |
| Package Weight | 9.19 Kilograms |
| Item Dimensions  LxWxH | 14 x 8 x 6 inches |
| Item Weight | 0.01 Ounces |
| Brand Name | H2O Performance Parts |
| Country of Origin | Taiwan |
| Manufacturer | Quality Mark |
| Part Number | Does Not Apply |
| Size | One Size |

## Images

![T-20939 4" Exhaust Manifold Riser Elbow Marine Power 0992-593 Sierra 18-1939 GLM 56140 - Image 1](https://m.media-amazon.com/images/I/81fvfUaiTtL.jpg)
![T-20939 4" Exhaust Manifold Riser Elbow Marine Power 0992-593 Sierra 18-1939 GLM 56140 - Image 2](https://m.media-amazon.com/images/I/81b4ihZlrwL.jpg)
![T-20939 4" Exhaust Manifold Riser Elbow Marine Power 0992-593 Sierra 18-1939 GLM 56140 - Image 3](https://m.media-amazon.com/images/I/81M89RKWttL.jpg)
![T-20939 4" Exhaust Manifold Riser Elbow Marine Power 0992-593 Sierra 18-1939 GLM 56140 - Image 4](https://m.media-amazon.com/images/I/818zlCA4HBL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐ as expected!
*by S***A on September 6, 2019*

I used this for my challenger '89 boat

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**Shop now:** [https://www.desertcart.sc/products/27656377-t-20939-4-exhaust-manifold-riser-elbow-marine-power-0992](https://www.desertcart.sc/products/27656377-t-20939-4-exhaust-manifold-riser-elbow-marine-power-0992)

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*Product available on Desertcart Seychelles*
*Store origin: SC*
*Last updated: 2026-02-20*