ERRECOM A/C Leak Stop Cartridge — Extreme Ultra 0.2 fl oz (6 mL) for R134a & R1234yf, Polymer-Free Leak Sealant

Errecom Extreme Ultra is a small, polymer-free A/C leak stop cartridge designed to seal minor refrigerant leaks in vehicle air-conditioning systems and works with both R134a and R1234yf.

This compact 0.2 fl oz (6 mL) cartridge is part of Errecom’s reusable, patented dispensing system and includes adapters for R1234yf and R134a. Formulated and manufactured in Italy, the product is intended for technicians and experienced DIYers to halt small leaks or apply preventative maintenance without risking blockages to expansion devices. It’s compatible with common refrigerants and lubricants and was developed by Errecom’s in-house chemistry team with OEM acceptance.

How does Extreme Ultra stop small A/C refrigerant leaks?

The cartridge delivers a reactive formula that targets tiny refrigerant escapes and creates a durable seal at the leak site. Because the mixture is free of polymers, it avoids swelling or lodgment in precision components, reducing the risk of blocking expansion valves or orifices.

• Seals hairline leaks in hoses, fittings, and small weld defects
• Compatible with both mineral and synthetic lubricants
• Safe for TXVs, TEVs, capillary tubes, and Schrader valves

What makes the formula safe for HVAC/R components?

Extreme Ultra uses a polymer-free chemistry that does not react with moisture or oxygen, minimizing deposit formation inside the system. This reduces the chance of contamination or clogging of sensitive metering devices when compared to polymer-based stop-leak additives.

• No polymer fragments to accumulate in expansion devices
• Formulated to remain inert with common refrigerants and oils
• Trusted by OEMs and developed in Errecom’s laboratory

Can I reuse the dispensing tool and what adapters are included?

Yes — the Extreme Ultra cartridge is designed for a reusable, refillable dispensing system protected by a US patent (US 11002470). The kit includes adapters for both R1234yf and R134a refrigerants so it fits the majority of vehicle A/C service ports.

• Reusable dispenser; buy cartridges alone for follow-up uses
• Includes R1234yf and R134a adapters for universal compatibility
• Compact 6 mL cartridge suitable for minor leak interventions

When should I use it and how should I check the system first?

Use Extreme Ultra for small, accessible leaks and as part of routine preventative maintenance to reduce future loss of refrigerant. Perform a brief vacuum test (about five minutes) to confirm the leak is small enough to respond to a stop-leak treatment before introducing the product into the system.

• Run a 5-minute vacuum test to evaluate leak severity
• Apply for minor leaks or preventative dosing during service
• Not intended for major ruptures or catastrophic failures

Who this product is for: Extreme Ultra is aimed at professional HVAC technicians, mobile A/C specialists and knowledgeable DIYers who need a compact, OEM-trusted solution for small refrigerant leaks or preventative maintenance. It’s particularly useful for shops wanting a refillable, cost-effective leak-stop option that avoids polymer residues and supports both R134a and R1234yf systems. For large leaks, structural repairs or safety-critical failures, seek standard mechanical repair and certified refrigerant recovery methods.