--- product_id: 50471586 title: "TSI Supercool 39241B-YF HFO-1234yf Total Leak Stop Plus U/V Dye. (NOT for USE in R134a Systems)" brand: "tsi supercool" price: "R1120" currency: ZAR in_stock: true reviews_count: 8 category: "Tsi Supercool" url: https://www.desertcart.co.za/products/50471586-tsi-supercool-39241b-yf-hfo-1234yf-total-leak-stop-plus store_origin: ZA region: South Africa --- # UV dye for rapid leak detection Includes HFO-1234yf quick connect adapter Stops leaks in metal & rubber A/C parts TSI Supercool 39241B-YF HFO-1234yf Total Leak Stop Plus U/V Dye. (NOT for USE in R134a Systems) **Brand:** tsi supercool **Price:** R1120 **Availability:** ✅ In Stock ## Summary > ❄️ Seal the deal, cool with confidence! ## Quick Answers - **What is this?** TSI Supercool 39241B-YF HFO-1234yf Total Leak Stop Plus U/V Dye. (NOT for USE in R134a Systems) by tsi supercool - **How much does it cost?** R1120 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/50471586-tsi-supercool-39241b-yf-hfo-1234yf-total-leak-stop-plus) ## Best For - tsi supercool enthusiasts ## Why This Product - Trusted tsi supercool brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Precision Leak Sealing:** Effectively seals small leaks in evaporators, condensers, hoses, gaskets & O-rings for lasting A/C performance. - • **All-in-One Leak Detection:** Highly visible UV dye lets you pinpoint leaks instantly, saving time and costly repairs. - • **Enhanced System Longevity:** Lubricates your A/C system to boost efficiency and extend compressor life, including hybrid & electric models. - • **Safe & Polymer-Free Formula:** HFC-free BOV delivery system protects your A/C components and recovery equipment without harmful residues. - • **Tailored for HFO-1234yf Systems:** Specifically engineered for HFO-1234yf refrigerant—ensures perfect fit and avoids cross-contamination with R134a systems. ## Overview TSI Supercool 39241B-YF is a specialized total leak stop and UV dye solution designed exclusively for HFO-1234yf automotive A/C systems. It effectively seals small leaks in metal and rubber components while lubricating the system to enhance performance and longevity. Featuring a patented HFC-free delivery system and a quick-connect adapter, it ensures safe, precise application without harming A/C parts or recovery equipment. One can treats a single vehicle, making it a must-have for proactive A/C maintenance. ## Description Total Leak Stop for HFO-1234yf AC Refrigerant systems. Stops small leaks in METAL & RUBBER A/C components including evaporators, condenser, hoses, gaskets & O-rings. (NOT FOR USE IN R134a SYSTEMS) Features Patented “HFC Free” BOV Delivery System for quick safe application. Lubricates A/C system to improve performance and help extend system life. Supercool Total Leak Stop does not contain harmful polymers and will not harm A/C system components, reclamation, or recovery equipment. Includes HFO-1234yf Application Hose with Quick Connect Coupler. Safe for hybrid & electric compressors. One can treats 1 vehicle. Review: works as advertised - Dye is highly visible and I was able to rapidly pinpoint the leak in my AC system. Worked like a champ. I am highly pleased. Please remember that you should not cross contaminate different coolant types. This one is for R-1234yf Review: product cheap junk - does not seal up at connection point on low side of ac hose dye was everywhere on top of engine not worth the money.have to wash down engine bay and start over ,had to pull vacuum and start over. product junk ## Features - Total Leak Stop for HFO-1234yf AC Refrigerant systems. Stops small leaks in METAL & RUBBER A/C components including evaporators, condenser, hoses, gaskets & O-rings. (NOT FOR USE IN R134a SYSTEMS) - IMPORTANT: Confirm your vehicle uses HFO-1234yf Refrigerant. HFO-1234yf low side service port adapter is larger in diameter than an R134a low side service port. The quick connect hose coupler should fit snugly. If it does not fit snugly it indicates the system is not an HFO-1234yf Refrigerant System - Each can is overfilled to ensure proper amount of fluid is injected into AC System and allows for residual fluid remaining in hose after application - Scan QR code on product box for short video on proper installation - 1 can treats 1 vehicle ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B01981J9DU | | Best Sellers Rank | #14,366 in Automotive ( See Top 100 in Automotive ) #210 in Air Conditioning Tools & Equipment | | Brand | TSI Supercool | | Brand Name | TSI Supercool | | Compatible Material | Metal, Rubber | | Customer Reviews | 3.8 out of 5 stars 280 Reviews | | Global Trade Identification Number | 00672264043262 | | Included Components | TSI Supercool 39241B-YF Total Leak Stop and U/V Dye, 1 oz (HFC Free BOV Can with 1234yf Adapter, Retail Box) | | Item Dimensions | 3.7 x 3.4 x 5.8 inches | | Item Form | Spray | | Item Type Name | TSI Supercool 39241B-YF Total Leak Stop and U/V Dye, 1 oz (HFC Free BOV Can with 1234yf Adapter, Retail Box) | | Item Weight | 1 ounces | | Item dimensions L x W x H | 3.7 x 3.4 x 5.8 inches | | Manufacturer | TSI Supercool | | Model | 39241B-YF | | Number of Items | 1 | | Part Number | 39241B-YF | | Style | 1234yf Adapter | | Style Name | 1234yf Adapter | | UPC | 672264043262 | | Unit Count | 1 Count | | Warranty Description | manufacturer warranty | ## Product Details - **Brand:** TSI Supercool - **Item Form:** Spray - **Item Weight:** 1 ounces - **Item dimensions L x W x H:** 3.7 x 3.4 x 5.8 inches - **Style:** 1234yf Adapter ## Images ![TSI Supercool 39241B-YF HFO-1234yf Total Leak Stop Plus U/V Dye. (NOT for USE in R134a Systems) - Image 1](https://m.media-amazon.com/images/I/71hJykbeHhL.jpg) ## Available Options This product comes in different **Style** options. ## Questions & Answers **Q: Can you use in home refrigator** A: It only works for HFO1234YF refrigerant **Q: Does this have refrigerant in it?** A: No it does not have refrigerant. **Q: Anybody had success with this?** A: yes, had a leak in the system with a dealer estimate of over 1k to fix. First use of this and leak was fixed **Q: Any tricks to get it to pump inside the system? . It doesn't have enough pressure** A: I'm not aware of any tricks. I think you just have to apply it when the pressure in your system is already pretty low. ## Customer Reviews ### ⭐⭐⭐⭐⭐ works as advertised *by K***R on July 18, 2026* Dye is highly visible and I was able to rapidly pinpoint the leak in my AC system. Worked like a champ. I am highly pleased. Please remember that you should not cross contaminate different coolant types. This one is for R-1234yf ### ⭐ product cheap junk *by E***H on July 30, 2026* does not seal up at connection point on low side of ac hose dye was everywhere on top of engine not worth the money.have to wash down engine bay and start over ,had to pull vacuum and start over. product junk ### ⭐⭐⭐⭐⭐ Actually worked *by S***X on July 3, 2026* I was pretty skeptical but after $3000 in repairs and trips to fours different mechanics (two dealers and two independents) this little can fixed my air leak. My 1234xy would last 2-3 weeks before. Now it is going on 9 weeks and is still going. Worth it and bought another. ## Frequently Bought Together - TSI Supercool 39241B-YF Total Leak Stop and U/V Dye, 1 oz (HFC Free BOV Can with 1234yf Adapter, Retail Box) - ZeroR® Genuine R1234YF in 8oz SSV Cans | 3 Cans with Zeror Service Label --- ## 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/50471586-tsi-supercool-39241b-yf-hfo-1234yf-total-leak-stop-plus](https://www.desertcart.co.za/products/50471586-tsi-supercool-39241b-yf-hfo-1234yf-total-leak-stop-plus) --- *Product available on Desertcart South Africa* *Store origin: ZA* *Last updated: 2026-08-29*