---
product_id: 18596776
title: "SELKIRK CORP 187703 3-Inch Wall Thimble, Silver"
brand: "selkirk sport"
price: "RM229"
currency: MYR
in_stock: true
reviews_count: 13
category: "Selkirk Sport"
url: https://www.desertcart.com.my/products/18596776-selkirk-corp-187703-3-inch-wall-thimble-silver
store_origin: MY
region: Malaysia
---

# UL-441 tested & certified for Type B vents Adjusts 4-1/8" to 7" wall thickness Maintains 1" air space from combustibles SELKIRK CORP 187703 3-Inch Wall Thimble, Silver

**Brand:** selkirk sport
**Price:** RM229
**Availability:** ✅ In Stock

## Summary

> 🔥 Elevate your venting game with precision and safety! 🔥

## Quick Answers

- **What is this?** SELKIRK CORP 187703 3-Inch Wall Thimble, Silver by selkirk sport
- **How much does it cost?** RM229 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.my](https://www.desertcart.com.my/products/18596776-selkirk-corp-187703-3-inch-wall-thimble-silver)

## Best For

- selkirk sport enthusiasts

## Why This Product

- Trusted selkirk sport brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Safety-First Design:** Built to maintain the critical 1-inch air gap from combustibles, protecting your home and peace of mind.
- • **Certified Reliability:** UL-441 tested and listed for Type B and B-W gas vents, trusted for both single and multi-story buildings.
- • **Durable & Lightweight:** Crafted from high-quality materials with a compact 6.8 x 6.8 x 4.2 inch design, weighing just 11.2 ounces for easy handling.
- • **Versatile Application:** Perfect for routing gas vent pipes through walls, compatible with a wide range of HVAC and heating setups.
- • **Precision Fit for Every Wall:** Adjustable collar fits walls from 4-1/8" to 7", ensuring seamless installation and a sleek finish.

## Overview

The SELKIRK CORP 187703 3-Inch Wall Thimble is an adjustable, UL-441 certified venting solution designed to fit wall thicknesses from 4-1/8" to 7". It ensures a safe 1-inch air space from combustibles, making it ideal for Type B and B-W gas vent installations in both single and multi-story buildings. Lightweight and durable, this silver wall thimble offers professional-grade reliability and ease of installation for modern HVAC and heating systems.

## Description

Product Description 3", 3RV-WT, Wall Thimble. Adjusts 4-1/8" to 7" to fit wall thickness. Round Type B gas vent. When installed according to manufacturer specifications, the wall thimble provides the required 1 inch air space to combustibles. Tested and listed per UL-441 for installation as type "B" and B-W gas vents to be installed in single and multi-story buildings. From the Manufacturer 3", 3RV-WT, Wall Thimble. Adjusts 4-1/8" to 7" to fit wall thickness. Round Type B gas vent. When installed according to manufacturer specifications, the wall thimble provides the required 1 inch air space to combustibles. Tested and listed per UL-441 for installation as type "B" and B-W gas vents to be installed in single and multi-story buildings.

Review: It works for keeping pipe away from combustionable materials. - I used these for a ceiling sleeve for B vent piping. Good quality, no issues.
Review: Quality thimble - I used this to route my diesel heater ducting through a shed wall. I built a small shed to house the heater outside to keep it out of the weather and just the duct work (heated air and the return air) to the building I needed to heat. It wasn’t the perfect size for the duct but I made a sheet metal adapter to make it a clean fit and install.

## Features

- 3", 3RV-WT, Wall Thimble
- Adjusts 4-1/8" to 7" to fit wall thickness
- Round Type B gas vent
- When installed according to manufacturer specifications, the wall thimble provides the required 1 inch air space to combustibles
- Tested and listed per UL-441 for installation as type "B" and B-W gas vents to be installed in single and multi-story buildings

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B002YFQSSW |
| Batteries Included? | No |
| Batteries Required? | No |
| Best Sellers Rank | #117,060 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #245 in HVAC Ducting |
| Capacity | 3 Cubic Inches |
| Color | Silver |
| Customer Reviews | 4.0 4.0 out of 5 stars (198) |
| Date First Available | January 1, 2008 |
| Included Components | SELKIRK CORP 187703 3-Inch Wall Thimble |
| Installation Method | Split System |
| Is Discontinued By Manufacturer | No |
| Item Package Quantity | 1 |
| Item Weight | 11.2 ounces |
| Item model number | 187703 |
| Manufacturer | SELKIRK CORP |
| Material | Plastic |
| Part Number | 187703 |
| Power Source | Corded Electric |
| Product Dimensions | 6.8 x 6.8 x 4.2 inches |
| Size | 1 Count (Pack of 1) |
| Sound Level | 14.4 Decibels |
| Special Features | Adjustable Collar |
| Warranty Description | Warranty |

## Product Details

- **Brand:** Selkirk Sport
- **Capacity:** 3 Cubic Inches
- **Color:** Silver
- **Form Factor:** Wall Thimble
- **Model Name:** SELKIRK CORP 187703 3-Inch Wall Thimble
- **Noise Level:** 14.4 Decibels
- **Power Source:** Corded Electric
- **Product Dimensions:** 8"D x 12"W x 14"H
- **Special Feature:** Adjustable Collar
- **Warranty Type:** Manufacturer’s Warranty

## Images

![SELKIRK CORP 187703 3-Inch Wall Thimble, Silver - Image 1](https://m.media-amazon.com/images/I/41-15obfc5L.jpg)
![SELKIRK CORP 187703 3-Inch Wall Thimble, Silver - Image 2](https://m.media-amazon.com/images/I/61wyWBqW15L.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ It works for keeping pipe away from combustionable materials.
*by J***N on May 18, 2025*

I used these for a ceiling sleeve for B vent piping. Good quality, no issues.

### ⭐⭐⭐⭐⭐ Quality thimble
*by T***N on December 5, 2025*

I used this to route my diesel heater ducting through a shed wall. I built a small shed to house the heater outside to keep it out of the weather and just the duct work (heated air and the return air) to the building I needed to heat. It wasn’t the perfect size for the duct but I made a sheet metal adapter to make it a clean fit and install.

### ⭐ 3.5 inch pipe opening.
*by T***R on December 11, 2025*

Too big. The interior diameter, which all the specifications say should support a 3 inch pipe, is slightly larger than 3.5 inches, which means it is being manufactured or advertised incorrectly. If it had a 4 inch opening I could maybe assume I received the wrong item, but it is too small for a 4 and too big for 3. Maybe it is designed to work with another piece of hardware specific to this brand, but it does not say so in the description. I don’t have time for a return, so I will be cutting my own adapter to make it work.

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*Product available on Desertcart Malaysia*
*Store origin: MY*
*Last updated: 2026-02-08*