Brass & Copper Adapters

HVAC Brass & Copper Adapters

The Brass & Copper Adapters category focuses on the transition fittings that make HVAC and plumbing connections work—the small parts that determine whether your installation is leak-free, serviceable and up to code. From mini-split flare connections to hydronic tie-ins and condensate drains, the right adapter lets you connect copper tube, valves and equipment ports without forcing the job or risking callbacks.

Here you’ll find flare adapters, sweat (solder) adapters, compression adapters, FIP/MIP (female/male pipe) x copper adapters, unions, reducers and specialty brass connectors sized for common HVAC and light-commercial plumbing applications. These fittings help you solve transitions between refrigerant line sets, copper water lines, valves, pumps, coils, manifolds and service ports, while maintaining proper sealing surfaces and flow paths.

• Brass flare adapters for mini-split, heat pump and refrigeration service valves.
• Copper sweat adapters for soldered tie-ins to coils, valves and manifolds.
• FIP/MIP x copper adapters to transition threaded piping to copper tube.
• Reducers and unions to match different tube sizes or extend existing lines.
• Compression and specialty adapters for condensate, water and low-pressure lines.

When selecting brass and copper adapters, always confirm tube size (OD), nominal pipe size, wall thickness, refrigerant or fluid type, maximum operating pressure and joint method (flare, solder, compression, threaded). Refrigerant lines typically use soft copper tube and flare fittings, while hydronic and domestic water lines may rely on sweat or press connections. Using the correct adapter helps protect against leaks, galvanic corrosion, flow restriction and premature joint failure.

Pro tip: Match to the manufacturer’s specifications. Always deburr and clean tube ends, use proper torque on flare fittings and pressure-test the system before charging. A few extra minutes selecting and installing the right adapter can prevent refrigerant loss, water damage and repeat trips.