---
product_id: 73992560
title: "Discover with Dr. Cool Replacement Rock Tumbler Barrel for National Geographic Professional Series Tumbler and Hobby Series Tumblers, 2 Pound Rock Polisher Barrel with Leak-Proof Lid"
brand: "discover with dr. cool"
price: "€ 41.56"
currency: EUR
in_stock: true
reviews_count: 12
category: "Discover With Dr. Cool"
url: https://www.desertcart.ie/products/73992560-discover-with-dr-cool-replacement-rock-tumbler-barrel-for-national
store_origin: IE
region: Ireland
---

# Leak-proof lid ensures mess-free use Quiet, low-noise rubber construction 2 lb capacity for pro-level polishing Discover with Dr. Cool Replacement Rock Tumbler Barrel for National Geographic Professional Series Tumbler and Hobby Series Tumblers, 2 Pound Rock Polisher Barrel with Leak-Proof Lid

**Brand:** discover with dr. cool
**Price:** € 41.56
**Availability:** ✅ In Stock

## Summary

> 💎 Polish like a pro—never settle for less than flawless shine!

## Quick Answers

- **What is this?** Discover with Dr. Cool Replacement Rock Tumbler Barrel for National Geographic Professional Series Tumbler and Hobby Series Tumblers, 2 Pound Rock Polisher Barrel with Leak-Proof Lid by discover with dr. cool
- **How much does it cost?** € 41.56 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.ie](https://www.desertcart.ie/products/73992560-discover-with-dr-cool-replacement-rock-tumbler-barrel-for-national)

## Best For

- discover with dr. cool enthusiasts

## Why This Product

- Trusted discover with dr. cool brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Durable & Quiet:** Rubber build minimizes noise while lasting through countless polishing cycles
- • **Leak-Proof Design:** Secure lid prevents spills, keeping your workspace pristine
- • **Expand Your Collection:** Perfect for polishing rocks, gemstones, petrified wood, and sea glass
- • **Universal Compatibility:** Fits National Geographic & Discover with Dr. Cool tumblers seamlessly
- • **Dedicated Polishing Barrel:** Avoid cross-contamination of grits for flawless gemstone shine

## Overview

The Discover with Dr. Cool Replacement Rock Tumbler Barrel is a 2-pound capacity, leak-proof, and quiet polishing barrel designed for professional and hobbyist rock tumblers. Compatible with National Geographic and Discover with Dr. Cool series, it ensures a dedicated, grit-free polishing step for superior gemstone finish. Durable rubber construction and a secure lid make it a must-have upgrade for any serious rock polisher.

## Description

Many professional rock enthusiasts keep a dedicated barrel on hand to complete the final stage of polishing because it can be very difficult to make sure that no grit is left behind in your barrel when switching between shaping and polishing steps in the tumbling process. By having an extra barrel, you don't have to worry about rougher grit scuffing up your gemstones while you are trying to get that finished polish.

Review: great tumbling barrel for smaller tumblers - exactly as advertised
Review: Works great - I have the grey National Geographic tumbler kit. Came with the small barrel that holds roughly a cup. This one is of the same build and quality. Seems about 3x the size. I don’t think you could go any bigger and still fit on the machine.

## Features

- POLISHING BARREL – This rock tumbler barrel allows you to polish like a pro. We recommend having a dedicated barrel that is only used for the final step in the polishing process to avoid leaving any remnants of rougher grits that might scratch your gemstones and diminish the final polish.
- REPLACEMENT PART – Barrel is compatible with the National Geographic Professional Rock Tumbler and Hobby Series Tumbler as well as the Discover with Dr. Cool Professional Rock Tumbler and Hobby Series Tumbler
- QUIET AND CONVENIENT – Constructed of durable rubber and with a leak-proof lid, this barrel is designed to be low-noise and easy to use
- EXPAND YOUR ROCK COLLECTION – Use this barrel to polish rocks, gemstones, petrified wood, sea glass, and much more
- 100% SATISFACTION GUARANTEE – Discover with Dr. Cool is committed to ensuring customers are completely satisfied with their purchase

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B077JGMBJJ |
| Age Range (Description) | 8 years and up |
| Best Sellers Rank | #79,856 in Arts, Crafts & Sewing ( See Top 100 in Arts, Crafts & Sewing ) #78 in Jewelry Making Polishing & Buffing |
| Brand | Discover with Dr. Cool |
| Color | Black |
| Customer Package Type | [SO] |
| Customer Reviews | 4.6 4.6 out of 5 stars (524) |
| Finish Type | Matte |
| Included Components | 1 Durable Leak Proof Replacement Barrel |
| Is Discontinued By Manufacturer | No |
| Item Weight | 1.3 pounds |
| Item model number | PROBARREL |
| Manufacturer | JMW Sales, Inc. |
| Manufacturer recommended age | 8 years and up |
| Material Feature | Insulated |
| Number of Items | 1 |
| Pattern | Solid |
| Product Care Instructions | Hand Wash Only |
| Product Dimensions | 5.4"W x 5.4"H |
| Release date | July 25, 2024 |
| Reusability | Reusable |
| Shape | Tumblers |
| Size | 1 Count (Pack of 1) |
| Special Feature | Leak Proof |
| Style | Modern |
| Theme | Hobbies |
| UPC | 816448023392 |
| Unit Count | 1 Count |

## Product Details

- **Brand:** Discover with Dr. Cool
- **Capacity:** 2 Pounds
- **Color:** Black
- **Material:** Rubber
- **Special Feature:** Leak Proof

## Images

![Discover with Dr. Cool Replacement Rock Tumbler Barrel for National Geographic Professional Series Tumbler and Hobby Series Tumblers, 2 Pound Rock Polisher Barrel with Leak-Proof Lid - Image 1](https://m.media-amazon.com/images/I/410-5+0CilL.jpg)
![Discover with Dr. Cool Replacement Rock Tumbler Barrel for National Geographic Professional Series Tumbler and Hobby Series Tumblers, 2 Pound Rock Polisher Barrel with Leak-Proof Lid - Image 2](https://m.media-amazon.com/images/I/51Uj4itNpGL.jpg)
![Discover with Dr. Cool Replacement Rock Tumbler Barrel for National Geographic Professional Series Tumbler and Hobby Series Tumblers, 2 Pound Rock Polisher Barrel with Leak-Proof Lid - Image 3](https://m.media-amazon.com/images/I/618OsVazlmL.jpg)
![Discover with Dr. Cool Replacement Rock Tumbler Barrel for National Geographic Professional Series Tumbler and Hobby Series Tumblers, 2 Pound Rock Polisher Barrel with Leak-Proof Lid - Image 4](https://m.media-amazon.com/images/I/71FjWayKs4L.jpg)
![Discover with Dr. Cool Replacement Rock Tumbler Barrel for National Geographic Professional Series Tumbler and Hobby Series Tumblers, 2 Pound Rock Polisher Barrel with Leak-Proof Lid - Image 5](https://m.media-amazon.com/images/I/812hULuYAfL.jpg)

## Questions & Answers

**Q: Is the metal on this barrel stainless steel?**
A: I've been running this barrel for 5 weeks now and seems to be running good. Metal appears to be stainless steel to me since it seems to be heavier than what aluminum would be.

**Q: How to assemble Barrel**
A: It is assembled. Tub and lid. May have to screw on knob to lid.

**Q: where is this made?**
A: Our tumbler barrels are manufactured in China.

**Q: I am looking for a 3 lb barrel for a national geographic rock tumbler.  Fo you have any idea where to find one.**
A: Please contact help@thinkbluemarble.com for parts under warranty.

## Customer Reviews

### ⭐⭐⭐⭐⭐ great tumbling barrel for smaller tumblers
*by S***R on October 6, 2025*

exactly as advertised

### ⭐⭐⭐⭐⭐ Works great
*by J***S on February 25, 2025*

I have the grey National Geographic tumbler kit. Came with the small barrel that holds roughly a cup. This one is of the same build and quality. Seems about 3x the size. I don’t think you could go any bigger and still fit on the machine.

### ⭐⭐⭐⭐⭐ Works well! No leaking!
*by F***4 on June 3, 2025*

So glad I found this! It works perfectly with the Nat Geo rock tumbler.

## Frequently Bought Together

- Discover with Dr. Cool Replacement Rock Tumbler Barrel for National Geographic Professional Series Tumbler and Hobby Series Tumblers, 2 Pound Rock Polisher Barrel with Leak-Proof Lid
- Blue Marble National Geographic Rock Tumbler Grit and Polish Refill Kit - Tumbling Grit Media, Polish Up to 20 lbs. of Rocks, Works with Any Rock Polisher, Rock Tumbler Supplies
- National Geographic Rock Tumbler Kit - 3 Lb. Extra Large Capacity Barrel with 3-Speed Motor & 9-Day Timer, Kit Includes Rocks for Tumbling and Rock Polisher Grit, Rock Tumbler for Adults and Kids

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*Product available on Desertcart Ireland*
*Store origin: IE*
*Last updated: 2026-01-27*