TSI Supercool HVAC leak-stop syringe, 2 fl. oz. (60 mL) with reusable application hose — seals leaks to 30 mm, no polymers

TSI Supercool 28399 is a 2 fl. oz. HVAC leak-stop syringe with a reusable application hose that permanently seals leaks up to 30 mm in A/C and refrigeration systems while protecting against corrosion.

This compact 60 mL syringe is formulated to treat systems up to 6 tons and installs using the included application hose. The formula contains no polymers so it won’t harm system components or react negatively with lubricants or refrigerants. Alongside sealing small leaks, the additive package is designed to reduce compressor noise and add corrosion protection for continued system reliability.

How does the syringe stop leaks without damaging system parts?

The leak-stopping formula is engineered to seal hairline and small leaks without polymer-based materials that can gum up valves or lines. Because it’s compatible with all refrigerants and lubricants, it circulates safely through the system and lodges at leak points to form a durable seal.

• Permanently seals leaks 30 mm and smaller
• No polymers—reduces contamination risk
• Compatible with existing system lubricants and refrigerants
• Flows through system lines for targeted sealing

How do I apply the TSI Supercool 28399 to an HVAC or refrigeration unit?

Application is simple: attach the reusable hose to the syringe, introduce the product into the system per manufacturer guidelines, and allow the system to circulate. The syringe size is optimized for smaller jobs and can treat systems up to 6 tons without overfilling.

• Includes reusable application hose for straightforward delivery
• 2 fl. oz. volume treats up to a 6-ton unit
• Use per service port instructions—NOT for automotive use
• Circulate system to locate and seal leaks reliably

Will this product affect system performance or lifespan?

TSI Supercool’s formula is designed to protect, not degrade, system performance. By sealing leaks, reducing compressor noise, and adding anti-corrosion additives, it can help maintain efficient operation without introducing harmful residues.

• Reduces compressor noise through improved lubrication and sealing
• Additive package helps prevent future corrosion
• No harmful residues from polymers to foul components
• Formulated to be compatible with a wide range of refrigerants

What limitations should I be aware of before using it?

While effective on small openings, the syringe is not a substitute for major repairs or replacing failed components. It does not fit automotive systems and is best used as a preventive or stopgap measure on HVAC and refrigeration equipment.

• Seals leaks up to 30 mm; larger leaks need mechanical repair
• Not intended for automotive air-conditioning systems
• Follow service procedures for safe pressurized-system access
• Best used as part of professional maintenance when possible

Who is this for: Technicians, building maintenance crews, and knowledgeable DIYers who need a compact, non-polymer leak-sealing solution for residential and commercial HVAC or refrigeration systems up to 6 tons. It’s ideal when you want a quick, system-compatible product that reduces noise, helps prevent corrosion, and avoids introducing polymer residues into equipment.