Condensate drain (CD) - air conditioner's drain line (or the condensate line).
What Is a Condensate Drain Line? | HomeServe USA
Tech Tip #3: HVAC Systems - HOW TO Correctly Install Condensate Drains - YouTube
How to Replace an HVAC Condensation Drain
PVC Condensate Drain Pipe 20mm x 4 Metre from Reece
PVC Condensate Drain P Trap 3/4" HVAC Air Conditioning Furnace Plumbing - North America HVAC
Amazon.com: 3/4 Inch Standard Condensate Trap with Cleaning Brush, PVC U Trap for HVAC Systems, Air Conditioner, Effectively Drains Condensate (1 Pack) : Industrial & Scientific
AC Condensate: How to avoid clogged drain lines
How to Fix a Clogged Furnace Condensate Drain Line. | Phyxter Home Services