Leak Saver refrigerant leak sealer for AC, refrigeration & automotive — Direct Inject UV with added UV dye, concentrated formula

Leak Saver Direct Inject UV is a direct-injection refrigerant leak sealer with an added UV dye that seals small leaks and highlights larger ones for inspection.

This concentrated formula injects easily into HVAC, refrigeration, and automotive systems to help stop minor refrigerant leaks and to reveal hard-to-find larger leaks under a UV light. Designed for convenience, the product works with common manifold gauge sets or Leak Saver injection kits, and is compatible with nearly all refrigerants and oils (ammonia systems excluded). It’s marketed both as a corrective treatment for recent minor leaks and as a preventive additive that circulates in the system.

How do I add Leak Saver Direct Inject UV to my system?

Injection is straightforward: connect the bottle to your manifold gauge set or use the Leak Saver Leak Shot Injection Kit for an even easier process. Automotive R134a systems require the standard 1/4” charging adapter; some mini-splits need a 5/16” to 1/4” adapter.

• Use a basic manifold gauge set or Leak Shot kit for quick connection.
• Automotive units: attach standard R134a 1/4” charging adapter.
• Mini-splits: may require a 5/16”→1/4” adapter for proper fit.
• Follow system service procedures; avoid introducing into ammonia systems.

Will this actually stop my refrigerant leak?

Leak Saver is formulated to seal small to moderate leaks where the system does not lose its full refrigerant charge within about 72 hours. The active chemistry reacts at the leak site with air and moisture, forming a durable seal; for very large leaks, the UV dye helps you locate the breach for mechanical repair.

• Best results on leaks that retain most of their charge for 72 hours.
• Seals react with air and moisture at the leak point to create a lasting barrier.
• Large breaches may remain unsealed—UV dye assists in locating them quickly.
• Not recommended for ammonia-based refrigeration systems.

Which systems and refrigerants are compatible with Leak Saver?

The product is compatible with a broad range of systems and refrigerants, including central AC, automotive air conditioning, ductless mini-splits, heat pumps, geothermal systems, and commercial refrigeration. It works with R410A, R22 and its replacements, R134a, R1234yf, R404A, R290, R600a and others, plus all common refrigeration oils.

• Works with residential, commercial, automotive, and specialty HVAC/R systems.
• Compatible with most refrigerants except ammonia-based systems.
• Safe to mix with standard refrigeration oils used in typical systems.
• Useful for micro-channel coils and modern refrigerant blends.

How is the UV dye useful, and how do I inspect for leaks?

The integrated UV dye glows under a UV flashlight, making it simple to find leaks that are too large to be sealed by the formula. After circulation, scan suspect components—fittings, coils, or brazed joints—with a UV light in a low-light environment to reveal dye traces at the leak points.

• Use a UV flashlight in dim lighting to see dye fluorescence.
• Inspect fittings, coil seams, and service valves for bright dye spots.
• Helpful both when the sealant cannot close a large gap and for routine leak detection.
• Clean surrounding oil residue first for clearer dye visibility.

Who this product is for: Leak Saver Direct Inject UV is intended for HVAC/R technicians, fleet and auto service shops, facilities maintenance teams, and savvy homeowners who perform system service. It’s suited to anyone who needs a fast, easy injection solution compatible with most refrigerants and who wants the option to both attempt a seal and visually locate stubborn leaks using UV inspection. Always follow service safety procedures and verify compatibility for ammonia systems before use.