--- product_id: 1708404 title: "Mastercool 81290 Valve Core Remover & Installer – Double-Ended Tool for R12/R134a Standard, JRA, and Eaton Large Bore Valve Cores" brand: "mastercool" price: "£14.85" currency: GBP in_stock: true reviews_count: 8 url: https://www.desertcart.co.uk/products/1708404-mastercool-81290-valve-core-remover-and-installer-double-ended-tool store_origin: GB region: United Kingdom --- # Compact 2.4-inch pocket-sized design Hardened steel shafts for durability Dual-ended for max compatibility Mastercool 81290 Valve Core Remover & Installer – Double-Ended Tool for R12/R134a Standard, JRA, and Eaton Large Bore Valve Cores **Brand:** mastercool **Price:** £14.85 **Availability:** ✅ In Stock ## Summary > 🛠️ Master every valve core job with precision and ease! ## Quick Answers - **What is this?** Mastercool 81290 Valve Core Remover & Installer – Double-Ended Tool for R12/R134a Standard, JRA, and Eaton Large Bore Valve Cores by mastercool - **How much does it cost?** £14.85 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.co.uk](https://www.desertcart.co.uk/products/1708404-mastercool-81290-valve-core-remover-and-installer-double-ended-tool) ## Best For - mastercool enthusiasts ## Why This Product - Trusted mastercool brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Built to Last:** Hardened steel shafts and solid steel body ensure rugged, long-term performance on every job. - • **Trusted by Pros:** Preferred by HVAC technicians for quick, reliable valve core servicing during recovery and retrofit. - • **Compact & Portable:** Pocket-sized design fits effortlessly in your toolkit—ready whenever and wherever you are. - • **Fast, Pressure-Free Service:** Optimized for valve core removal/installation when systems are depressurized, speeding up repairs. - • **All-in-One Valve Core Solution:** Dual-ended tool covers Standard, JRA & Eaton large bore cores for ultimate versatility. ## Overview The Mastercool 81290 is a compact, dual-ended valve core remover and installer designed for R12 and R134a systems. Featuring hardened steel shafts compatible with Standard, JRA, and Eaton large bore valve cores, this durable tool enables fast, pressure-free servicing. Its pocket-sized form factor makes it an essential, portable companion for HVAC professionals handling system recovery, repair, or retrofit tasks. ## Description Versatile Valve Core Tool for R12 and R134a SystemsThe Mastercool 81290 Valve Core Remover & Installer is a compact, dual-ended tool designed to service R12 and R134a systems when not under pressure. This versatile tool features hardened steel shafts to handle Standard, JRA, and Eaton large bore valve cores, giving technicians broad compatibility in a single, pocket-sized tool.It’s the perfect solution for system recovery, repair, or retrofit tasks where refrigerant has already been evacuated. Built with a durable steel body and precision-fit shafts, the 81290 is a technician favorite for quick valve core servicing.What's Included:Dual-ended valve core remover/installer toolHardened steel shafts for Standard, JRA, and Eaton large bore cores ## Features - ✔️ Compact Tool for R12 and R134a Valve Cores – Designed for use when the system is not pressurized. - ✔️ Covers Standard, JRA, and Eaton Large Bore Cores – Dual-ended shafts provide maximum compatibility in one tool. - ✔️ Simple, Fast Valve Core Service – Ideal for use during system evacuation, recovery, or repair. - ✔️ Durable Construction – Hardened steel shafts and solid steel body ensure long-lasting use. - ✔️ Easy to Store and Carry – Pocket-sized tool that fits easily in any kit or toolbox. ## Technical Specifications | Specification | Value | |---------------|-------| | Manufacturer | Mastercool | | Brand | Mastercool | | Model | 81291 | | Item Weight | 0.8 ounces | | Product Dimensions | 2.4 x 2.3 x 1.1 inches | | Item model number | Standard/JRA/Eaton – R12/R134a | | Is Discontinued By Manufacturer | No | | Manufacturer Part Number | 81290 | | Special Features | All Purpose | | National Stock Number | 5120-01-592-4515 | ## Product Details - **Brand:** Mastercool - **Item Form:** Steel - **Scent:** Unscented - **Specific Uses For Product:** Used on R12/R134a Standard and JRA/EATON Large Bore R134a Valve Cores - **Material Feature:** Hardened Steel Shafts ## Images ![Mastercool 81290 Valve Core Remover & Installer – Double-Ended Tool for R12/R134a Standard, JRA, and Eaton Large Bore Valve Cores - Image 1](https://m.media-amazon.com/images/I/51LBTBj-RjL.jpg) ## Available Options This product comes in different **Model** options. ## Customer Reviews ### ⭐⭐⭐⭐⭐ It works great like it should *by M***S on July 31, 2023* The media could not be loaded. It worked out great to help replace my Ac low side schrader valve on my 01 Tahoe which is the main cause of lost ac Freon on these trucks that I have seen. It’s a good size to help with tightening and loosening, and not loosing it as well like my previous one. It has 2 different sizes to fit other valves which is nice. ### ⭐⭐⭐⭐⭐ A great tool to have around *by J***T on July 27, 2024* I noticed a leak in my car's AC low side connection. I ordered the tool and got it the next day. It took about 30 seconds to reseat the schrader valve. God only knows how many $$$ a repair shop would have charged. ### ⭐⭐⭐⭐⭐ One quality tool is worth one hundred low quality tools *by B***N on June 24, 2023* After fighting with this valve for 2 days I finally got this tool in the mail. As you can see the valve had been completely tore up by lesser quality valve tools that either broke off or stripped out when force was applied.I put this tool on, tapped it with a mallet to seat it on the valve, and used a pair of pliers to turn it. It saved me from having to run a new ac line or have a shop do it for hundreds of dollars! It’s great quality and appears it will hold up to just about anything. Worth the xtra premium ## Frequently Bought Together - Mastercool 81290 Valve Core Remover & Installer – Double-Ended Tool for R12/R134a Standard, JRA, and Eaton Large Bore Valve Cores - Four Seasons 26783 Cap & Valve Air Conditioning System Seal Kit - ROSY PIXEL Diking R134A R12 A/C HVAC Air Conditioner Schrader Valve Stem Core Remover Tool (Remover Tool) --- ## 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.uk/products/1708404-mastercool-81290-valve-core-remover-and-installer-double-ended-tool](https://www.desertcart.co.uk/products/1708404-mastercool-81290-valve-core-remover-and-installer-double-ended-tool) --- *Product available on Desertcart United Kingdom* *Store origin: GB* *Last updated: 2026-06-13*