Flare Union Kit — Set of 2 Brass Male-Male Refrigeration Flare Unions for Copper Line Sets (1/4"×3/8", 1/4"×1/2", 3/8"×5/8", 1/4"×5/8")

Extend or repair refrigeration line sets the right way with this Flare Union Kit. Each kit includes 2 high-quality, solid-brass male-to-male flare unions for joining copper tubing on HVAC mini-split and heat pump systems. Precision-machined threads and tapered seats help ensure a tight, leak-resistant seal when installed with proper flares and torque. Ideal for service technicians and advanced DIYers working with R-410A or R-454B refrigerants on traditional (flared) copper line sets.

Note: Not for pre-charged “quick-connect” style line sets. Use the manufacturer’s quick-connect couplers for those systems.

Key Features

• Set of 2 brass flare unions (male-male) per kit

• Sizes available: 1/4"×3/8", 1/4"×1/2", 3/8"×5/8", 1/4"×5/8"

• Leak-resistant flare seats for HVAC/R copper line sets

• Durable, corrosion-resistant brass for long service life

• Compatible refrigerants: R-410A, R-454B (and other common A/C refrigerants)

• Applications: extending, repairing, or rerouting copper line sets on mini-splits and heat pumps

What’s Included

• (2) Brass flare unions in the selected size

Best Practices: clean flares, oil threads, proper torque, nitrogen pressure test)

Variant / SKU Mapping

• 1/4" × 3/8" — SKU: FU-KIT-1/4-3/8

• 1/4" × 1/2" — SKU: FU-KIT-1/4-1/2

• 3/8" × 5/8" — SKU: FU-KIT-3/8-5/8

• 1/4" × 5/8" — SKU: FU-KIT-1/4-5/8