Drain Fittings & Adapters

Adapters & Drain Fittings

The Drain Fittings & Adapters category includes the essential connection parts used to build, modify and service HVAC condensate systems. These fittings allow you to route, connect and transition between various drain line sizes and materials—ensuring proper flow, secure connections and reduced risk of leaks in both residential and commercial HVAC installations.

Here you’ll find a complete lineup of PVC drain adapters, barbed-to-PVC connectors, threaded adapters, elbows, tees, couplings, unions and flexible drain fittings commonly used on air handlers, mini-split systems, cassette units, rooftop units and drain pans. Whether you're replacing an existing drain line, installing a new system or adding service points such as cleanouts and traps, the right fittings ensure long-term reliability and code compliance.

• PVC and CPVC drain adapters for 3/4" and 1" HVAC drains.
• Barbed connectors for vinyl condensate tubing and pump discharge lines.
• Threaded fittings for pan outlets, auxiliary drains and mini-split lines.
• Elbows, tees and wyes to route drains through tight or complex areas.
• Flexible adapters for transitions between rigid pipe and tubing.

When selecting fittings, verify the line size (commonly 3/4"), material type (PVC, CPVC, vinyl tubing), application (primary, secondary, or pump discharge), slope and accessibility. Proper fittings ensure smooth flow and help prevent long-term clogs, algae buildup and water intrusion in sensitive areas like attics and closets.

Pro tip: Use barbed adapters with stainless clamps on mini-split drain lines and condensate pump outlets for a secure, leak-free connection that withstands vibration and pressure spikes.