HCLSK2 HVAC-R Leak Sealant – 2 oz Syringe, 45° Swivel Adapter, Up to 6 Tons

The HCPRO Performance HCLSK2 is a pre-charged 2 oz HVAC-R leak sealant with a 45° swivel low-side adapter — it seals pinhole, porous-metal and micro-leaks in HVAC, refrigeration and automotive A/C.

Key features

• Up to 6 tons per syringe — rated for operation up to 800 PSI
• 45° swivel adapter — reaches tight low-side service ports
• Universal refrigerants — R-410A, R-134a, R-22, R-1234yf, R-404A, R-407C, R-290 and R-600
• All major oils — POE, PAG, mineral and alkylbenzene
• Anti-corrosion additives — refrigerant-soluble formula, not for ammonia systems

Who this sealant is for

HVAC technicians chasing slow refrigerant loss on residential split systems and mini-splits. Mobile auto A/C techs sealing leaks without recovering refrigerant. Refrigeration contractors restoring system pressure on walk-in coolers and reach-ins. Fleet maintenance crews keeping commercial A/C units running. Anyone whose customer's system is losing 1–2 oz per week and they don't want a $1,500 compressor replacement.

When to use it

For micro-leaks, pinhole leaks, and porous metal leaks that drop pressure over weeks or months but aren't visually locatable. Screw the 45° adapter onto the syringe, connect to the low-side service port, inject with the system running. No refrigerant recovery required. One 2 oz syringe treats up to a 6-ton system. NOT for mechanical leaks at loose fittings, fractured copper, or split hoses — replace those components.

Why HCLSK2 vs cheap stop-leak products

Cheap stop-leak uses polymer chemistry that hardens throughout the system and clogs TXVs, orifices, and evaporator coils. HCLSK2's refrigerant-soluble formula only reacts at leak points where it contacts atmosphere — the rest of the system stays clean. Anti-corrosion additive prevents the underlying corrosion that caused the leak from spreading. Rated to 800 PSI for R-410A high-pressure systems. Universal oil and refrigerant compatibility.

Available in single 2 oz syringe, 2-pack, 4-pack, and 12-pack at trade pricing. Manufactured in the USA to industry HVAC-R sealant performance standards.