---
product_id: 328233582
title: "20 Pieces Foam Stopper Plastic Foam Plug 50mm Openings for Tubes and Flasks, Beer Making, Yeast Starter"
brand: "outus"
price: "KD 4.25"
currency: KWD
in_stock: true
reviews_count: 8
url: https://www.desertcart.com.kw/products/328233582-20-pieces-foam-stopper-plastic-foam-plug-50mm-openings-tubes
store_origin: KW
region: Kuwait
---

# 120°C heat resistance 50mm diameter Durable polyurethane 20 Pieces Foam Stopper Plastic Foam Plug 50mm Openings for Tubes and Flasks, Beer Making, Yeast Starter

**Brand:** outus
**Price:** KD 4.25
**Availability:** ✅ In Stock

## Summary

> 🍻 Brew with Confidence: Elevate Your Crafting Game!

## Quick Answers

- **What is this?** 20 Pieces Foam Stopper Plastic Foam Plug 50mm Openings for Tubes and Flasks, Beer Making, Yeast Starter by outus
- **How much does it cost?** KD 4.25 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.kw](https://www.desertcart.com.kw/products/328233582-20-pieces-foam-stopper-plastic-foam-plug-50mm-openings-tubes)

## Best For

- outus enthusiasts

## Why This Product

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

## Key Features

- • **Perfect Fit:** Designed for containers under 45mm diameter.
- • **Abundant Supply:** 20 foam plugs for endless experimentation!
- • **Versatile Usage:** Ideal for brewing, lab work, and more!
- • **Airflow Advantage:** Allows oxygen in while keeping contaminants out.
- • **Temperature Resilience:** Withstands up to 120°C for all your brewing needs.

## Overview

This set of 20 foam stoppers is crafted from durable polyurethane, designed to fit containers with a diameter of less than 45mm. With a heat resistance of up to 120°C, these plugs allow for optimal airflow while preventing contamination, making them perfect for brewing and laboratory applications.

## Description

20 Pieces Foam Stopper Plastic Foam Plug 50mm Openings for Tubes and Flasks, Beer Making, Yeast Starter

## Features

- Abundant in amount: you will receive 20 pieces white foam plugs, the amount is quite enough for you to use with test tubes and flasks, easily manipulate to fit flasks or tubes
- Reliable material: this foam plug is made of polyurethane material, with a temperature resistance of up to 120 degrees Celsius, safe to use, and it will rebound without deformation within 24 hours, durable enough to be applied for a long time
- Product size: the diameter of this foam stopper is 50 mm/ 1.96 inch, and the height is 38 mm/1.5 inch, suitable for containers with a diameter less than 45 mm, come and use these foam stoppers with confidence
- Different with rubber stopper: as opposed to a rubber stopper and airlock, a foam plug stopper allows airflow in and out of the flask while still preventing unhealthy things from entering the flask, allowing airflow in to get the oxygen your food or other things need while still letting CO2 out
- Usage scenes: these foam plugs are suitable for stoppering most types of container, such as tubes or flasks, eliminating the need for messy and hard to use aluminum foil, also can be applied to using beers for lagers

## Images

![20 Pieces Foam Stopper Plastic Foam Plug 50mm Openings for Tubes and Flasks, Beer Making, Yeast Starter - Image 1](https://m.media-amazon.com/images/I/71ijByVMvJL.jpg)
![20 Pieces Foam Stopper Plastic Foam Plug 50mm Openings for Tubes and Flasks, Beer Making, Yeast Starter - Image 2](https://m.media-amazon.com/images/I/71p27Ed9ZbL.jpg)
![20 Pieces Foam Stopper Plastic Foam Plug 50mm Openings for Tubes and Flasks, Beer Making, Yeast Starter - Image 3](https://m.media-amazon.com/images/I/71aDQsjZXyS.jpg)
![20 Pieces Foam Stopper Plastic Foam Plug 50mm Openings for Tubes and Flasks, Beer Making, Yeast Starter - Image 4](https://m.media-amazon.com/images/I/71nVsncuhoS.jpg)
![20 Pieces Foam Stopper Plastic Foam Plug 50mm Openings for Tubes and Flasks, Beer Making, Yeast Starter - Image 5](https://m.media-amazon.com/images/I/71qXUpLkP3S.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Not just for the lab! Theater/HiFi use as well
*by R***X on October 10, 2024*

These are meant to be flask stoppers, but I've actually bought these to use as speaker port plugs.They do come vacuum sealed, I opened the bag and left them in there for a couple days - by the time I was ready to use them they had perfectly returned to their intended shape. May require a bit of patience, but they do bounce back!The 2" diameter and soft foam is a great fit across multiple bookshelf speakers! Using my speakers with a subwoofer so decided to plug the LCR ports as I didn't need the bass extension and a flatter response curve is never a bad thing.These fit perfectly in my Triangle HiFi Borea BR03, BR02, and BRC1 and helped tighten up the mids while getting rid of some of the bass response (unwanted, in my case).

### ⭐⭐⭐⭐⭐ Good purchase
*by J***Z on April 16, 2025*

Arrived as promised. nice product.

### ⭐⭐⭐⭐ they fit not tight
*by N***G on May 31, 2025*

they’re good they fit. They’re just not very tightly sealed.

## Frequently Bought Together

- 20 Pieces Foam Stopper Plastic Foam Plug 50mm Openings for Tubes and Flasks, Beer Making, Yeast Starter
- Cole-Parmer Laboratory Grade Glass Erlenmeyer Flask, 2000 mL
- 2000ml Narrow Mouth Erlenmeyer Flask, 3.3 Borosilicate Glass, Karter Scientific 213G15 (Single)

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**Shop now:** [https://www.desertcart.com.kw/products/328233582-20-pieces-foam-stopper-plastic-foam-plug-50mm-openings-tubes](https://www.desertcart.com.kw/products/328233582-20-pieces-foam-stopper-plastic-foam-plug-50mm-openings-tubes)

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*Product available on Desertcart Kuwait*
*Store origin: KW*
*Last updated: 2026-02-07*