What are drain fittings and adapters used for in HVAC?

They are used to connect and transition condensate drain lines and tubing—adapting equipment outlets, traps, pumps, and accessories for reliable drainage.

How do I choose the right drain adapter?

Match the tubing or pipe size and the connection type (barb, slip, or threaded) to the equipment outlet or accessory you are connecting.

Do barbed fittings need clamps?

Yes. Barbed fittings are typically paired with clamps to secure flexible tubing and reduce leaks—especially on pump discharge and vibration-prone installs.

What helps prevent slow drains and clogs?

Use proper slope for gravity drains, avoid sharp restrictions, support long runs, and minimize unnecessary transitions that can trap debris.

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Drain Fittings & Adapters

Condensate Lines • Size Transitions • Leak-Resistant Connections

Drain Fittings & Adapters

Drain fittings & adapters help you connect, transition, and rebuild HVAC condensate drain systems with clean, professional results. From barbed adapters and reducers to threaded transitions and couplings, these parts make it easy to match tubing sizes, equipment outlets, traps, and drain accessories without leaks or makeshift fixes.

Whether you’re replacing a condensate pump, adding a safety switch, correcting an improper drain setup, or finishing a new install, shop by connection style (barb / slip / threaded) and size to fit the job.

Reducers & transitions for common drain and tubing sizes
Barbed fittings for flexible tubing connections (secure with clamps)
Threaded adapters for equipment outlets and accessories
Couplings & unions for service-friendly repairs
Elbows & tees to route lines cleanly and avoid kinks

Confirm outlet size, tubing size, and connection type before ordering. For best flow, minimize unnecessary transitions, avoid sharp restrictions, and maintain proper slope where gravity drainage is used.

Pro tip: Keep the top sizes in stock (reducers + barbed adapters + a few elbows). These are frequent “save the call” parts on pump swaps and drain line rebuilds—and they bundle well with tubing and clamps.

HVAC drain fittings and adapters including barbed fittings, reducers, couplings, threaded adapters, elbows and tees

Shop Drain Fittings & Adapters

Barbed Adapters Connect flexible tubing to fittings and outlets. Reducers & Transitions Move between common tubing and drain sizes. Threaded Adapters For threaded outlets, traps, and accessories. Couplings & Unions Service-friendly connections for repairs. Elbows & Tees Route drain lines cleanly and avoid kinks. All Drain Fittings Browse the full selection for build-outs.

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Drain Fittings & Adapters

Drain Fittings & Adapters

Shop Drain Fittings & Adapters

Drain fittings and adapters for HVAC condensate lines and tubing