FlareSeal Mini-Split Flare Seals MSP-0610 Pack — (2) 3/8" & (2) 5/8", Coated Copper Leak-Resistant

FlareSeal Model MSP-0610 is a clip-on copper gasket engineered to create a crush-style, leak-resistant seal for 3/8" liquid and 5/8" suction mini-split flare connections.

When installing or servicing ductless mini-split systems (30,000–42,000 BTU / roughly 3–4 ton), the most common source of refrigerant loss is the SAE 45° flare joint. FlareSeal MSP-0610 addresses vibration, surface scratches, minor misalignment and debris by adding a multi-ring copper sealing element that is fully coated to improve conformity and durability. This product ships as a mini-split pack containing two 3/8" and two 5/8" seals, sized for typical liquid and suction lines found on larger ductless units.

How does FlareSeal stop leaks at flare connections?

The MSP-0610 uses an engineered multi-ring copper face that compresses into the mating flare to form a tight, crush-style seal. A protective coating over the copper fills microscopic scratches and improves resilience to vibration without requiring welding or replacement of fittings.

• Multi-ring profile compensates for surface imperfections and small misalignments
• Coated copper resists wear and improves sealing on older fittings
• Clip-on design installs without specialized tools

Will these seals fit my ductless mini-split lines?

The MSP-0610 pack is designed specifically for systems that use 3/8" liquid lines and 5/8" suction lines — common on 30,000–42,000 BTU mini-splits. If your system uses those nominal flare sizes, these seals provide a direct replacement or retrofit option.

• Includes two 3/8" and two 5/8" seals to match common mini-split configurations
• Works with standard SAE 45° flare fittings found on most ductless units
• Also compatible with related components: pilot lines, TXVs, filter driers, Schrader valves (with Schrader-Seal)

How simple is installation and can it be used on existing leaks?

Installation is straightforward: the seal clips onto the male flare and is compressed when the flare nut is tightened, creating the crush seal. It’s suitable both for new assemblies and as a retrofit to stop active leaks without disassembling the entire line.

• No special tools — clips on, then tighten the flare nut to form the seal
• Effective on slightly scratched or imperfect mating surfaces
• Useful as a field fix to stop refrigerant loss quickly during service calls

What applications and environments is FlareSeal best suited for?

MSP-0610 was developed for HVAC/R technicians working on ductless mini-splits, refrigerant lines and accessory components where vibration and pressure cycles challenge flare joints. It’s favored by professionals and OEMs that want a reliable mechanical seal without brazing or replacing fittings.

• Designed for mini-split systems rated ~30,000–42,000 BTU (3–4 tons)
• Suitable for pilot lines, EVR/EPV fittings, Schrader valves (with matching cap), TXVs and filter driers
• Practical for field service, maintenance kits, and installer tool boxes

Who is this for: FlareSeal MSP-0610 is aimed at HVAC/R installers, service technicians, contractors and facility maintenance teams who handle ductless mini-split systems and need a fast, durable way to eliminate flare leaks. If you want a non-invasive, OEM-trusted sealing option for 3/8" liquid and 5/8" suction lines — whether for new installs or repairing existing leaks — this mini-split pack provides the right sizes and a simple clip-on installation that saves time and reduces refrigerant loss risk.