--- product_id: 403741234 title: "JG Speedfit CM451214FS 12mm x 1/2\" BSP Female Water Adaptors (2 Pack)" brand: "john guest" price: "$22.34" currency: USD in_stock: true reviews_count: 13 category: "John Guest" url: https://www.desertcart.us/products/403741234-jg-speedfit-cm451214fs-12mm-x-1-2-bsp-female-water store_origin: US region: United States of America --- # Leakproof push-fit tech Tool-free install in seconds 2-pack precision brass adapters JG Speedfit CM451214FS 12mm x 1/2" BSP Female Water Adaptors (2 Pack) **Brand:** john guest **Price:** $22.34 **Availability:** ✅ In Stock ## Summary > 💧 Upgrade your plumbing game with leakproof speed and style! ## Quick Answers - **What is this?** JG Speedfit CM451214FS 12mm x 1/2" BSP Female Water Adaptors (2 Pack) by john guest - **How much does it cost?** $22.34 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/403741234-jg-speedfit-cm451214fs-12mm-x-1-2-bsp-female-water) ## Best For - john guest enthusiasts ## Why This Product - Trusted john guest brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Leakproof Confidence:** Pressure and temperature tested to exceed industry standards—no leaks, no stress. - • **Universal Compatibility:** Seamlessly connects 1/2" BSP threaded pipes to 12mm plastic or copper pipes. - • **Compact & Lightweight Design:** Small 40x25x25mm size and 20g weight make it perfect for tight spaces and mobile setups. - • **Effortless Push-Fit Installation:** Snap in place without tools or glue—save time and hassle on every job. - • **Premium Corrosion-Resistant Brass:** Built to last with durable brass that resists scale and corrosion for worry-free plumbing. ## Overview John Guest’s 2-pack 1/2" BSP to 12mm female water adapters deliver premium brass durability and effortless push-fit installation. Designed for quick, tool-free connections that resist corrosion and leaks, these compact fittings are trusted by professionals and DIYers alike for reliable plumbing in tight spaces or mobile setups. ## Description Product Description Why Choose JG Speedfit? JG Speedfit push-fit plumbing and heating • Install, demount and refit in seconds without tools • Safer and cleaner with no hot works, flux or glue • Less labour-intensive, especially in tight spaces • Non-toxic, resists corrosion and scale build-up • High performance leakproof connections / compatible with plastic or copper pipe How to make a connection - Standard Fittings Standard Fittings Push pipe up to Pipe Stop. If the Speedfit pipe has been cut correctly the insertion mark on the pipe will be level with the collet head Pull to check connection is secure and test the system Twist & Lock Fittings Twist the screwcap until it touches the body flange. This increases the O-Ring seal around the pipe and locks the pipe into position If you are not using collet clips, ensure that the screwcaps are in the locked position. Pull to check it is secure Premium Piece On every product John Guest Speedfit make, you’ll find the JG monogram proudly stamped, as a mark of trusted authenticity and quality. All their products are pressure and temperature tested to ensure they meet and exceed exacting industry standards. Review: Leak free top quality - Excellent quality from John Guest. Don’t bother with cheap alternatives. These seal excellent and work on our water filter (running at 5bar). Review: Great for our converted campervan plumbings. - Following lots of YouTube tutorials we were recommended the John guest push and fit fittings. They are easy to use, we have had no leakage issues, just make sure your pipes have a nice clean cut. We also found the little round inserts to keep the piping in a circular shape handy. Great value for money and ease for newbies. ## Features - John guest female 1/2 bsp to 12mm push fit water adaptor **(2 pack)** - John guest ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B09Q969VJV | | Best Sellers Rank | 1,984 in Business, Industry & Science ( See Top 100 in Business, Industry & Science ) 3 in Pipe Fitting Adapters | | Brand | John Guest | | Colour | White | | Connector Type | Adapter | | Connector type | Adapter | | Customer Reviews | 4.7 out of 5 stars 279 Reviews | | Item Dimensions | 40 x 25 x 25 millimetres | | Item Weight | 20 Grams | | Item dimensions L x W x H | 40 x 25 x 25 millimetres | | Manufacturer | John Guest | | Material | Brass | | Number of Pieces | 2 | | Part Number | FITSET | | Set Name | John Guest 2-Piece 1/2" BSP to 12mm Female Water Adapter Set | | Size | 12mm | | Thread Size | 1/2" | | Thread Type | BSP | | Unit Count | 1.0 count | ## Product Details - **Size:** 12mm - **Material:** Brass - **Brand:** John Guest - **Colour:** White - **Item dimensions L x W x H:** 40 x 25 x 25 millimetres - **Connector type:** Adapter - **Thread size:** 1/2" - **Thread type:** BSP - **Item weight:** 20 Grams - **Number of pieces:** 2 ## Images ![JG Speedfit CM451214FS 12mm x 1/2" BSP Female Water Adaptors (2 Pack) - Image 1](https://m.media-amazon.com/images/I/51lCl0OZZrL.jpg) ![JG Speedfit CM451214FS 12mm x 1/2" BSP Female Water Adaptors (2 Pack) - Image 2](https://m.media-amazon.com/images/I/61ZbX4X5M3L.jpg) ## Available Options This product comes in different **Style** options. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Leak free top quality *by D***M on 6 April 2026* Excellent quality from John Guest. Don’t bother with cheap alternatives. These seal excellent and work on our water filter (running at 5bar). ### ⭐⭐⭐⭐⭐ Great for our converted campervan plumbings. *by A***Y on 16 December 2025* Following lots of YouTube tutorials we were recommended the John guest push and fit fittings. They are easy to use, we have had no leakage issues, just make sure your pipes have a nice clean cut. We also found the little round inserts to keep the piping in a circular shape handy. Great value for money and ease for newbies. ### ⭐⭐⭐⭐⭐ Secure and totally watertight. *by F***O on 19 April 2026* First time I've used these type of push fits. Sceptical at first. But these john guest fittings are absolutely brilliant. Zero leaks. Just use quality pipe as well. ## Frequently Bought Together - John Guest Female 1/2" BSP to 12mm Push Fit Water Adaptor **(2 Pack)** - John Guest PP Shut Off Valve Connection 12 mm (One Supplied) - John Guest Male 1/2" BSP to 12mm Push Fit Water Adaptor **(2 Pack)** --- ## 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.us/products/403741234-jg-speedfit-cm451214fs-12mm-x-1-2-bsp-female-water](https://www.desertcart.us/products/403741234-jg-speedfit-cm451214fs-12mm-x-1-2-bsp-female-water) --- *Product available on Desertcart United States of America* *Store origin: US* *Last updated: 2026-07-09*