We have spent around 39 hours to find the right option for you and based on our research Highside Chemicals 10001 Leak Lock 1.33 Ounce Tube is our top pick for you. This is one of the best products currently available in the market. However, if you don’t want to spend extra hours then we have another great option for you is Highside Chemicals 10004 Leak Lock 4 Ounce Brush-Top Plastic Jar. Here is a review of some of the best hvac leak sealant, together with their features and functions.
As you read, through the article, you will understand some of the top hvac leak sealant and learn more about their features. Let’s proceed without wasting any more time.
Best hvac leak sealant

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Leak Saver: Direct Inject – Refrigerant Leak Sealer – For Systems Up to 5 Tons – Compatible With Most Air Conditioner and Refrigeration Systems – Proudly Made in the USA
Leak Saver: Direct Inject - Refrigerant Leak Sealer - For Systems Up to 5 Tons - Compatible With Most Air Conditioner and Refrigeration Systems - Proudly Made in the USA
Features
- STOP LEAKS PERMANENTLY - The Leak Saver can permanently seal small refrigerant leaks where the complete refrigerant charge is not lost within 7 days. 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 INCLUDING CARS - Our product is compatible with all systems, refrigerants (except ammonia), car refrigerants, and oils. It is great for central air conditioners, 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
- STRAIGHTFORWARD INSTALLATION - No more fussing with messy syringes, hoses, or pressurized cans. The Leak Saver HVAC sealant 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. You can see our straightforward installation videos below
- SAFE FOR ALL TOOLS AND PARTS - Our HVAC leak sealer is safe for all manifold gauges, hoses, expansion valves (TXVs, TEVs, capillary tubes, etc), Schrader valves, and anything needed to service your system. Adapter required for mini splits (5/16" to 1/4") and automotive systems ( 134A to 1/4")
- THE MOST TRUSTED - The numbers don’t lie! With more than 4,000,000 units sold of our air conditioner leak sealer formula since 2015, we are the most trusted leak sealant among HVAC professionals. Proudly made in the USA. We stand 100% behind the quality of our products. If for any reason you are not satisfied with your order, reach out to us and we will make it right
Refrigeration Technologies RT201B Nylog Gasket/Thread Sealant
Refrigeration Technologies RT201B Nylog Gasket/Thread Sealant
$9.85 in stock
Features
- Will not Contaminate Systems
- Seals Flares and Threaded Connections
- Lubricates O-Rings and Gaskets
- Approved by OEM Manufacturers
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
Features
- 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
Highside Chemicals 10004 Leak Lock 4 Ounce Brush-Top Plastic Jar
Highside Chemicals 10004 Leak Lock 4 Ounce Brush-Top Plastic Jar
Features
- Soft setting pipe joint compound for sealing threaded joints, flanged joints, gasket surfaces and mating surfaces
- Ideal for metal and plastic materials subject to extreme vibrations
- Resin based brushable paste remains permanently flexible
- Adheres to internal surfaces and fills voids
- 4 ounce brush top plastic jar
Red Devil 0841DS RD-DS 181 Acrylic Latex Duct Sealant, 1/2 Gallon, Gray
Red Devil 0841DS RD-DS 181 Acrylic Latex Duct Sealant, 1/2 Gallon, Gray
Features
- PERMANENTLY FLEXIBLE: Acrylic latex formula provides excellent elasticity and water resistance
- INTERIOR / EXTERIOR USE: Can be used either inside or outside the home
- STRONG ADHESIVE GRIP: Provides a tough bond on metal to metal connections
- NON FLAMMABLE: Safe to use in enclosed areas. Made in the USA
- DISCOLORATION RESISTANT: Cured sealant will not discolor over time
Refrigeration Technologies RT200R Nylog- Gasket/Thread Sealant
Refrigeration Technologies RT200R Nylog- Gasket/Thread Sealant
Features
- It’s a Sealant: Gaskets coated with Nylon will never dry or become heat fixed to the surface
- It’s a Lubricant: Nylon can be used as a high tack assembly lube when installing shaft seals, O-ring
- Schrader valves, ball valves, unloaders or other system components
- NYLOG RED: Is based on Mineral Oil and used on Ammonia, Propane, CFC or HCFC systems.
Vapco Xpress Seal Starter Kit – Professional A/C & Refrigeration sealant for systems 1.5 to 5 tons. MADE IN USA & over 2 million systems sealed.
Vapco Xpress Seal Starter Kit - Professional A/C & Refrigeration sealant for systems 1.5 to 5 tons. MADE IN USA & over 2 million systems sealed.
Features
- Fastest acting seal on the market.
- Permanent seal in A/C condensers, evaporators, fittings, and metal line sets.
- Made in USA with over 2 million units sealed.
- Compatible with all refrigerants (excluding ammonia).
- Starter KIT includes CO2 gun & cartridge + Xpress Seal tube.
Highside Chemicals 10001 Leak Lock 1.33 Ounce Tube
Highside Chemicals 10001 Leak Lock 1.33 Ounce Tube
Features
- Soft-setting Pipe-joint Compound For Sealing Threaded Joints, Flanged Joints, Gasket Surfaces & Mating Surfaces
Super Seal Flex Inject Coil Repair Leak Sealant – HVAC/R – Condenser & Evaporator Coils
Super Seal Flex Inject Coil Repair Leak Sealant - HVAC/R - Condenser & Evaporator Coils
Leak Saver: Direct Inject Ultimate – 3-in-1 Leak Sealant with Moisture Remover and UV Dye for Air Conditioner, Heat Pumps and More – Works on most HVAC and Automotive Systems – Proudly Made in the USA
Leak Saver: Direct Inject Ultimate - 3-in-1 Leak Sealant with Moisture Remover and UV Dye for Air Conditioner, Heat Pumps and More - Works on most HVAC and Automotive Systems - Proudly Made in the USA
Features
- 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!
- STOP LEAKS PERMANENTLY - The Leak Saver can permanently seal refrigerant leaks where the complete refrigerant charge is not lost within 7 days. 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 & REFRIGERANTS INCLUDING CARS - Our product is compatible with all systems, refrigerants (except ammonia), car refrigerants, and oils. It is great for central air conditioners, 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
- STRAIGHTFORWARD INSTALLATION - No more fussing with messy syringes, hoses, or pressurized cans. The Leak Saver HVAC sealant 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. You can see our straightforward installation videos below
- SAFE FOR ALL TOOLS AND PARTS - Our HVAC leak sealer is safe for all manifold gauges, hoses, expansion valves (TXVs, TEVs, capillary tubes, etc), Schrader valves, and anything needed to service your system. Adapter required for mini splits (5/16" to 1/4") and automotive systems ( 134A to 1/4")
With this, our list of best hvac leak sealant has come to an end. Like we said in the earlier part of this post, we have done extensive research on these hvac leak sealant. Not to mention, the prices of the hvac leak sealant are also flexible. You should also check Nu-Calgon 4050-11 EasySeal Direct Inject-UV Dye Refrigerant Leak Sealant, Treats 1.5-5 Tons one of the most sold items in the market.