What is this extra pipe dripping into my sink drain?
The extra dripping pipe is an HVAC condensation drain line routed into your household plumbing. When it leaks or drips continuously, it usually points to a clog or blockage in the outflow line that prevents proper drainage.
What people tried
Every workaround mentioned in the threads below. We haven’t tested any of them — and nobody here is claiming they worked.
- 1Moving the hose clamp closer to the end of the hose and tightening it down
- 2Clearing a potential clog in the line
- 3Turn off the AC so it stops draining
- 4Put a bucket under the drip
- 5Use a line blower from Home Depot
- 6Suck the line out with a shop vac
- 7Adding a T vent to help with head pressure
- 8Shortening the tube at the pump
- 9Replacing the tube with 3/4 inch PVC and installing a trap
In their words
Unedited, most upvoted first, each linked to the thread it came from.
“Old ac was replaced recently. I added the T vent cause the drain pan wasn’t draining due to head pressure caused by the other end sitting in water at the pump.”source ↗
“I’ve been checking the blue plug occasionally and noticed some water collecting.”source ↗
“What is this extra pipe coming into my sink piping?”source ↗
“This attached pipe is currently dripping. What is it and how do i fix it?”source ↗
“This L-shaped PVC pipe is high up on the exterior wall of my house and I noticed water dripping from it.”source ↗
“Is this likely the secondary/emergency condensate drain from the AC coil? If it’s dripping, does that usually mean the primary condensate line is clogged and I should check the drain pan?”source ↗
“I’d say about a gallon or 2 of water has been dripping from this for the past 2 hours or so.”source ↗