--- product_id: 84129920 title: "GSC International RS-9-2 Rubber Stoppers, Size 9, Drilled 2-Holes (1-Pound Pack),Black" price: "R641" currency: ZAR in_stock: true reviews_count: 2 url: https://www.desertcart.co.za/products/84129920-gsc-international-rs-9-2-rubber-stoppers-size-9-drilled store_origin: ZA region: South Africa --- # Durable black rubber Size #9 precision fit Dual drilled holes for versatility GSC International RS-9-2 Rubber Stoppers, Size 9, Drilled 2-Holes (1-Pound Pack),Black **Price:** R641 **Availability:** ✅ In Stock ## Summary > 🧬 Seal your success with precision and style! ## Quick Answers - **What is this?** GSC International RS-9-2 Rubber Stoppers, Size 9, Drilled 2-Holes (1-Pound Pack),Black - **How much does it cost?** R641 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.co.za](https://www.desertcart.co.za/products/84129920-gsc-international-rs-9-2-rubber-stoppers-size-9-drilled) ## Best For - Customers looking for quality international products ## Why This Product - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Dual-Hole Design:** Facilitates complex airflow or liquid transfer, empowering advanced scientific projects and hands-on learning. - • **Bulk 1-Pound Pack:** Ample supply for classrooms or labs, minimizing downtime and maximizing productivity during experiments. - • **Premium Black Rubber:** Crafted for durability and a secure, airtight seal that withstands repeated use in educational and professional labs. - • **Trusted by Educators:** Backed by positive reviews and trusted in STEM curricula to elevate science education with practical, real-world applications. - • **Perfect STEM Lab Essential:** Engineered for seamless integration with standard 5-gallon glass carboys and test tubes, ensuring reliable experimental setups. ## Overview The RS-9-2 Rubber Stoppers are size #9, black rubber stoppers featuring two drilled holes, designed for secure fits on standard lab glassware including 5-gallon carboys. Sold in a convenient 1-pound pack, these stoppers support advanced STEM experiments by enabling controlled airflow or liquid transfer, making them a reliable choice for educators and lab professionals alike. ## Description Science education products incorporate applied math and science principles into classroom and homeschool-based projects. Teachers in pre-K, elementary, and secondary classrooms use science education kits and products alongside science, technology, engineering, and math (STEM) curriculum to demonstrate STEM concepts and real-world applications through hands-on activities. Science education projects include a broad range of activities, such as practical experiments in engineering, aeronautics, robotics, energy, chemistry, physics, biology, and geology.GSC International distributes science education materials and laboratory supplies. The company, founded in 1993, is headquartered in Nixa, Missouri. Review: Fits the Old Glass Five Gallon Carboys. - This RS-9-2 Size fits the Five Gallon Glass Carboys, I use them on my first jug on my RO/DI Cascade system for the Ultra Pure water. See my comment on the RS-10-2 size plugs. Review: Shoppers beware of poor standard online products - The stopper is hard and does not fit properly on the conical flask. My son could not record the right data for temperature-volume graph and Pressure-volume graph. The poor boy was unable present good enough science project for thermal expansion of water. I odered twice to be sure of the standard. Terms and conditions for odering not favorable ## Features - Rubber test-tube stopper - Size #9 - Two hole - Black - Includes 1 lb. of stoppers ## Technical Specifications | Specification | Value | |---------------|-------| | Customer Reviews | 4.0 out of 5 stars 9 Reviews | ## Images ![GSC International RS-9-2 Rubber Stoppers, Size 9, Drilled 2-Holes (1-Pound Pack),Black - Image 1](https://m.media-amazon.com/images/I/61Sa7+wQIOS.jpg) ![GSC International RS-9-2 Rubber Stoppers, Size 9, Drilled 2-Holes (1-Pound Pack),Black - Image 2](https://m.media-amazon.com/images/I/7140x9bNCtL.jpg) ## Customer Reviews ### ⭐⭐⭐⭐⭐ Fits the Old Glass Five Gallon Carboys. *by D***. on December 13, 2018* This RS-9-2 Size fits the Five Gallon Glass Carboys, I use them on my first jug on my RO/DI Cascade system for the Ultra Pure water. See my comment on the RS-10-2 size plugs. ### ⭐ Shoppers beware of poor standard online products *by J***N on December 18, 2019* The stopper is hard and does not fit properly on the conical flask. My son could not record the right data for temperature-volume graph and Pressure-volume graph. The poor boy was unable present good enough science project for thermal expansion of water. I odered twice to be sure of the standard. Terms and conditions for odering not favorable --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.co.za/products/84129920-gsc-international-rs-9-2-rubber-stoppers-size-9-drilled](https://www.desertcart.co.za/products/84129920-gsc-international-rs-9-2-rubber-stoppers-size-9-drilled) --- *Product available on Desertcart South Africa* *Store origin: ZA* *Last updated: 2026-05-31*