Calling out an appliance repair person is expensive, so it may behoove you to try one of these AC leak stoppers first if your unit is giving you problems.

They can deliver an instant and economical fix for many car and household air conditioning issues.

we’ve put together a collection of the best AC Leak Stoppers that are currently available on the market. To help you find the perfect AC Leak Stopper among a wide variety of options, we constantly update our collection with new and trending models.

10 Best AC Leak Stoppers

Based on dozens of customer reviews and ratings, the followings are the top 10 best-selling AC Leak Stoppers:

# Preview Product Price
1 AC Pro Car Air Conditioner R134A Refrigerant Stop Leak Kit, For Rubber and Metal Leaks in O Rings and Hoses, 3 Oz, MRL-3 AC Pro Car Air Conditioner R134A Refrigerant Stop Leak Kit, For Rubber and Metal Leaks in O Rings… $22.95 View Product
2 Leak Saver: Direct Inject Ultimate 3-in-1 Leak Sealant with Moisture Remover and UV Dye for AC, Refrigeration, and Automotive Systems up to 5 Tons - Compatible with All Refrigerants - Made in The USA Leak Saver: Direct Inject Ultimate 3-in-1 Leak Sealant with Moisture Remover and UV Dye for AC,… $44.95 View Product
3 Leak Saver Direct Inject for Air Conditioner, Refrigeration, Automotive Systems Leak Saver Direct Inject for Air Conditioner, Refrigeration, Automotive Systems $33.99 View Product
4 InterDynamics Certified AC Pro Car Air Conditioner R134A Refrigerant Stop Leak Kit, for Rubber and Metal Leaks in O Rings and Hoses, 3 Oz, CERT325-6 InterDynamics Certified AC Pro Car Air Conditioner R134A Refrigerant Stop Leak Kit, for Rubber and… $22.99 View Product
5 Leak Saver: Direct Inject UV - Refrigerant Leak Sealer with Added UV Dye to Detect Large Leaks - For AC, Refrigeration, and Automotive Systems Up to 5 Tons - Compatible with All Refrigerants Leak Saver: Direct Inject UV – Refrigerant Leak Sealer with Added UV Dye to Detect Large Leaks – For… $34.95 View Product
6 Leak Saver Direct Inject Dry A/C Moisture Remover (No Leak Sealant, Moisture Remover Only) - for Systems Up to 5 Tons - Converts Moisture into Synthetic Oil - Created and Used by HVAC Pros - USA Made Leak Saver Direct Inject Dry A/C Moisture Remover (No Leak Sealant, Moisture Remover Only) – for… $34.95 View Product
7 Bar's Leaks 1186 Liquid Aluminum Stop Leak - 16.9 oz , Gray Bar’s Leaks 1186 Liquid Aluminum Stop Leak – 16.9 oz , Gray $7.43 View Product
8 Red Angel A/C Stop Leak & Conditioner Red Angel A/C Stop Leak & Conditioner $32.99 View Product
9 Nu-Calgon 4050-11 EasySeal Direct Inject-UV Dye Refrigerant Leak Sealant, Treats 1.5-5 Tons Nu-Calgon 4050-11 EasySeal Direct Inject-UV Dye Refrigerant Leak Sealant, Treats 1.5-5 Tons $68.26 View Product
10 TSI Supercool 28399 HVAC Leak Stop Syringe with Application Hose, 2 fl. oz. (60 mL) TSI Supercool 28399 HVAC Leak Stop Syringe with Application Hose, 2 fl. oz. (60 mL) $26.79 View Product

Top Rated AC Leak Stopper Reviews

Since we’ve mentioned 10 different models of AC Leak Stoppers on the above list, it may be difficult for you to find the right one for your needs. This is why we listed the key features of each of these AC Leak Stoppers below:

1

AC Pro Car Air Conditioner R134A Refrigerant Stop Leak Kit, For Rubber and Metal Leaks in O Rings and Hoses, 3 Oz, MRL-3
AC Pro Car Air Conditioner R134A Refrigerant Stop Leak Kit, For Rubber and Metal Leaks in O Rings and Hoses, 3 Oz, MRL-3

$22.95
View Product
Product Highlights:

  • Seals metal leaks in condensers, evaporators, accumulators, receiver and driers
  • Seals rubber leaks in hoses, O-rings, gaskets
  • Safe for all R-134A systems and recovery equipment
  • Compatible with all lubricants
  • Comes with recharge hose
2

Leak Saver: Direct Inject Ultimate 3-in-1 Leak Sealant with Moisture Remover and UV Dye for AC, Refrigeration, and Automotive Systems up to 5 Tons - Compatible with All Refrigerants - Made in The USA
Leak Saver: Direct Inject Ultimate 3-in-1 Leak Sealant with Moisture Remover and UV Dye for AC, Refrigeration, and Automotive Systems up to 5 Tons – Compatible with All Refrigerants – Made in The USA

$44.95
View Product
Product Highlights:

  • THE EASIEST INJECTION METHOD: No more fussing with messy syringes, hoses, or pressurized cans. The Leak Saver injects directly and easily into the system with a basic manifold gauge set or even easier with our Leak Shot Injection Kits. Note: for automotive systems, you will still need the standard 134A to 1/4” charging adapter. Mini-splits may require a 5/16” to 1/4” charging adapter.
  • 3 in 1 SEALANT + MOISTURE REMOVER + UV DYE : Our proven leak sealant now includes moisture remover and UV dye for the complete system treatment! Now, you can seal your leak, remove system moisture, or find large leaks with the UV Dye…all in one easy to install package!
  • OVER THREE MILLION UNITS SOLD SINCE 2015: The Leak Saver can permanently seal small refrigerant leaks where the complete refrigerant charge is not lost within 72 hours. It works similarly to how blood in your body reacts to a cut. When a leak occurs, the Leak Saver reacts with the air and moisture at the leak site to permanently seal the leak. When used for preventative maintenance, the active ingredient circulates safely in the system to seal future leaks.
  • WORKS WITH ALL SYSTEMS AND REFRIGERANTS: Compatible with all systems, refrigerants (except ammonia), and oils. Useit on the following systems: central AC, mini split AC, cassette AC, car, refrigerated truck, home refrigerator, commercial refrigerator, boat, rv, ice machine, refrigeration racks, chillers, refrigeration condenser, cold rooms, and more. It also works with all refrigerants including R410A Freon, R22 and replacements, R134A, R1234yf, R404A, R290, R600a, and more.
  • YOUR SATISFACTION IS OUR PRIORITY: We stand behind the effectiveness 100%. If for any reason you are not satisfied with your product, please contact us and we will make it right.
3

Leak Saver Direct Inject for Air Conditioner, Refrigeration, Automotive Systems
Leak Saver Direct Inject for Air Conditioner, Refrigeration, Automotive Systems

$33.99
View Product
Product Highlights:

  • THE EASIEST INJECTION METHOD: No more fussing with messy syringes, hoses, or pressurized cans. The Leak Saver injects directly and easily into the system with a basic manifold gauge set or even easier with our Leak Shot Injection Kits. Note: for automotive systems, you will still need the standard 134A to 1/4” charging adapter. Mini-splits may require a 5/16” to 1/4” charging adapter.
  • A PERMANENT FIX FOR LEAKS: The Leak Saver can permanently seal small refrigerant leaks where the complete refrigerant charge is not lost within 72 hours. It’s similar to how blood in your body reacts to a cut. When a leak occurs, the Leak Saver reacts with the air and moisture at the leak site to permanently seal the leak. When used for preventative maintenance, the active ingredient circulates safely in the system to seal future leaks.
  • OVER THREE MILLION UNITS SOLD: With over 3 million units sold of this sealant formula since 2015, we are the most reliable leak sealant among HVAC professionals. 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.
  • YOUR SATISFACTION IS OUR PRIORITY: 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).
4

InterDynamics Certified AC Pro Car Air Conditioner R134A Refrigerant Stop Leak Kit, for Rubber and Metal Leaks in O Rings and Hoses, 3 Oz, CERT325-6
InterDynamics Certified AC Pro Car Air Conditioner R134A Refrigerant Stop Leak Kit, for Rubber and Metal Leaks in O Rings and Hoses, 3 Oz, CERT325-6

$22.99
View Product
Product Highlights:

  • Seals metal leaks in condensers, evaporators, accumulators, receiver and driers
  • Seals rubber leaks in hoses O-rings and gaskets
  • Comes with recharge hose
  • Safe for all R-134a systems
  • Professional grade
5

Leak Saver: Direct Inject UV - Refrigerant Leak Sealer with Added UV Dye to Detect Large Leaks - For AC, Refrigeration, and Automotive Systems Up to 5 Tons - Compatible with All Refrigerants
Leak Saver: Direct Inject UV – Refrigerant Leak Sealer with Added UV Dye to Detect Large Leaks – For AC, Refrigeration, and Automotive Systems Up to 5 Tons – Compatible with All Refrigerants

$34.95
View Product
Product Highlights:

  • THE EASIEST INJECTION METHOD: No more fussing with messy syringes, hoses, or pressurized cans. The Leak Saver injects directly and easily into the system with a basic manifold gauge set or even easier with our Leak Shot Injection Kits. Note: for automotive systems, you will still need the standard 134A to 1/4” charging adapter. Mini-splits may require a 5/16” to 1/4” charging adapter.
  • MORE THAN 3 MILLION UNITS SOLD SINCE 2015: The Leak Saver can permanently seal small refrigerant leaks where the complete refrigerant charge is not lost within 72 hours. It’s similar to how blood in your body reacts to a cut. When a leak occurs, the Leak Saver reacts with the air and moisture at the leak site to permanently seal the leak. When used for preventative maintenance, the active ingredient circulates safely in the system to seal future leaks.
  • WITH ADDED UV DYE FOR FINDING LARGE LEAKS: Seal it or find it! If you have a leak that is simply too large for leak sealants to seal, the added UV Dye will light up brightly at the leak site when using a UV flashlight.
  • COMPATIBLE WITH ALL SYSTEMS AND REFRIGERANTS: : The Leak Saver UV is compatible with all systems, refrigerants (except ammonia), and oils. It is great for central air conditioners, car and automotive air conditioners, refrigerators, ductless mini-splits, heat pumps, geothermal heat pumps, commercial refrigeration systems, micro channel coils and more. It also works with all refrigerants including R410A Freon, R22 and replacements, R134A, R1234yf, R404A, R290, R600a, and more.
  • YOUR SATISFACTION IS OUR PRIORITY: We stand behind the effectiveness 100%. If for any reason you are not satisfied with your product, please contact us and we will make it right.
6

Leak Saver Direct Inject Dry A/C Moisture Remover (No Leak Sealant, Moisture Remover Only) - for Systems Up to 5 Tons - Converts Moisture into Synthetic Oil - Created and Used by HVAC Pros - USA Made
Leak Saver Direct Inject Dry A/C Moisture Remover (No Leak Sealant, Moisture Remover Only) – for Systems Up to 5 Tons – Converts Moisture into Synthetic Oil – Created and Used by HVAC Pros – USA Made

$34.95
View Product
Product Highlights:

  • GET YOUR A/C BACK UP AND RUNNING: Help prevent system failure, preserve efficiency and eliminate corrosion by converting system moisture into synthetic oil.
  • FOR MOST AIR-CONDITIONING SYSTEMS: Use on mini-split units, heat pumps, packaged units, central A/Cs, coolers, microchannel coils, and automotive applications.
  • THE FASTER, MORE ECONOMICAL CHOICE: By converting moisture into synthetic oil, it mixes with the already existing oil, for a simpler process than vacuum pumping.
  • THE PERFECT PREP FOR LEAK REPAIRS: Use alone to dry your air-conditioning system or pair with our Leak Saver Direct Inject (our refrigerant leak sealer) for leaks.
  • 100% SATISFACTION GUARANTEE: If for any reason this didn’t work out and you’re unsatisfied, contact us for another at no cost (must be installed by certified HVAC techs).
Sale7

Bar's Leaks 1186 Liquid Aluminum Stop Leak - 16.9 oz , Gray
Bar’s Leaks 1186 Liquid Aluminum Stop Leak – 16.9 oz , Gray

$7.43
View Product
Product Highlights:

  • Bar’s Leaks Liquid Aluminum Stop Leak seals radiator leaks. Seals freeze plug leaks. Repairs gasket leaks and heater core leaks. Lowers water temperature.
  • Seals radiator leaks
  • Seals freeze plug leaks
  • Repairs gasket leaks
  • Special Shipping Information: This item cannot be returned and has additional shipping restrictions
8

Red Angel A/C Stop Leak & Conditioner
Red Angel A/C Stop Leak & Conditioner

$32.99
View Product
Product Highlights:

  • Guaranteed Permanent Seal
  • Will Not Clog or Damage the A/C System or Recovery Unit
  • Compatible with R-134a
9

Nu-Calgon 4050-11 EasySeal Direct Inject-UV Dye Refrigerant Leak Sealant, Treats 1.5-5 Tons
Nu-Calgon 4050-11 EasySeal Direct Inject-UV Dye Refrigerant Leak Sealant, Treats 1.5-5 Tons

$68.26
View Product
Product Highlights:

  • 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
  • Leak Sealant
10

TSI Supercool 28399 HVAC Leak Stop Syringe with Application Hose, 2 fl. oz. (60 mL)
TSI Supercool 28399 HVAC Leak Stop Syringe with Application Hose, 2 fl. oz. (60 mL)

$26.79
View Product
Product Highlights:

  • 2-Ounce Syringe Treats Up to 6 Ton Units
  • Permanently Seals Leaks in A/C and Refrigeration Systems
  • Does Not Contain Polymers, Will Not Harm A/C System Or Components
  • Additive Package Protects Against Future Corrosion
  • Compatible with All Lubricants and Refrigerants

Video Overview

AC Stop Leak – Does It Work? My Results

AC Stop Leak – Does It Work? My Results In this video The Average Dan shares the results of using AC Stop Leak to stop and/or slow an air conditioner AC …

Final Words

So, these are all of the Best AC Leak Stoppers available on the market. We hope this collection was helpful to find the right AC Leak Stopper for the money. However, we recommend checking out the features, benefits, and problems of each of these AC Leak Stoppers before taking your decision.