10 Best Ac Leak Sealer of December 2025

• TAKE A LOOK AT THE NUMBERS: Two million applications and counting, you can confidently seal small refrigerant leaks with a proven leak sealer (systems up to 5 tons).
• THE EASIEST INJECTION METHOD: Patent-pending and made to be completely fuss-free, no pump downs, syringes, or pressure-sensitive cans needed again!
• A PERMANENT FIX FOR LEAKS: Super concentrated and made to work with all types of refrigerants, it’s compatible with all types of refrigerants and oils (except ammonia).
• MADE BY HVAC PROFESSIONALS: And used by them, it’s perfect for use in Split Systems, Heat Pumps, Commercial Unit Coolers, Refrigeration Systems, and more.
• 100% SATISFACTION GUARANTEE: We’re so sure this will seal your next leak that if it doesn’t, contact us for another at no cost (must be installed by certified HVAC techs).

Leak Saver

• Nu-Colon Inc. (NUCAC)
• This is a genuine replacement part
• Appliance-replacement-parts
• Country of Origin: United States

Nu Calgon

• Concentrated
• No Pump Down
• For use in heat pumps, split and mini split systems, packaged units, and micro-channel coils
• Two sizes available 0-1.5 Ton, 1.5-5 Ton
• Compatible with all refrigerants, except ammonia

ENVIRO-SAFE

• AC leak freeze permanently seals leaks in air conditioning and refrigeration systems
• Will continue to seal additional leaks for up to 1 year that meet testing specifications
• Does not contain polymers
• Tested to be non-clogging to a/C compressor and recovery unit
• Ideal for preventive maintenance and leak protection
• This is an aftermarket of generic part

Rectorseal

GCP

• MADE IN USA - America's Most Trusted AC/R Stop Leak.
• SUPER SEAL + DRY R & FLASH - 3-in-1: Dries, Seals, + Dye.
• 1.5-5 TONS - permanently seals & prevents leaks in all A/C & refrigeration systems
• Includes DRY R to increase system efficiency & FLASH UV Dye to find leaks.
• Professional HVACR use - compatible with all oils & refrigerants, hose included.

Cliplight

• AC leak freeze permanently seals leaks in air conditioning and refrigeration systems
• Will continue to seal additional leaks for up to 1 year that meet testing specifications
• Does not contain polymers & oem approved
• Tested to be non-clogging to a/C compressor and recovery unit
• Ideal for preventive maintenance and leak protection
• This is an aftermarket of generic part

Rectorseal

• Concentrated formula means less material in system
• Clear tube so you can see the sealant go in
• No need to pump down R-410A units
• Perfect for split systems, heat pumps, microchannel coils, packaged units, and mini splits
• One time use
• Packaging may vary

Nu Calgon

• Permanently seals refrigerant leaks and prevents future leaks; use with systems up to 5 tons.
• Safe for all air conditioner and refrigeration systems, valves, and tools. Compatible with all types of refrigerants and oils.
• Injects easily and directly. No more pump downs, fussy syringes, or pressure sensitive cans; UV dye can detect large leaks requiring repair.
• Designed and used by HVAC professionals, our formula has been proven through over a decade of research.
• Proudly made in the USA.

Leak Saver

• Remarkable ability to repair and seal leaks in condensers, evaporators, connection hoses, gaskets, and O-rings
• Contains no solid or particulate matter that will clog the A/C system, or harm a recovery unit
• Forms a chemical weld sealing leaks in both R-12 or R-134a systems
• Safe to use and best of all — it’s a permanent seal
• Guaranteed

BlueDevil Products