Why can't I replace a flexible sink drain with rigid PVC?
Installers often claim rigid PVC cannot replace unsightly corrugated drain pipes because off-the-shelf rigid kits lack the exact alignment and adjustability needed for existing wall stub-outs and tailpieces. This leaves homeowners stuck with an ugly, incorrect flex line that professionals advise fixing, even though tight spaces or misaligned plumbing make a hard-piped conversion difficult to fit.
What people tried
Every workaround mentioned in the threads below. We haven’t tested any of them — and nobody here is claiming they worked.
Found another way around this?
Share your steps and trade-offs so fellow engineers don't have to reinvent the wheel. No account required.
- 1Keeping the existing corrugated pipe and floor drain setup as dictated by the interior teamDid this help you?
- 2Replacing flexible pipes with conventional rigid setupsDid this help you?
- 3Using smooth-walled flexible kits to save spaceDid this help you?
- 4Using flexible DIY drain linesDid this help you?
- 5putting the flexible p-trap back onDid this help you?
- 6piping in a real p-trap with unionsDid this help you?
- 7Using the flexible/corrugated drain pipe that came bundled with the sink setDid this help you?
- 8replacing the accordion pipe with regular PVC pipeDid this help you?
In their words
Unedited, grouped by where they were said, most upvoted first within each place, each linked to the thread it came from.
“Does this drain set up look okay or should it be redone?”source ↗
“Previous flipper/homeowner had this beauty of an idea for under our bathroom sink. This accordion plastic “pipe” I think is causing the whole sink area to smell bad. How the heck do I go about replacing that accordion pipe with regular pvc pipe?”source ↗
“looks Mint...if you're blind. None of that is correct”source ↗
“Not sure why anyone would use the flex line. Fix it right.”source ↗
“It’s fine, but I would personally get rid of the flex pipe”source ↗
“Title explains it all, from the supply lines to drainage, how can I make this look pretty and get rid of the flexible diy drain lines, TIA!!”source ↗
“Before just putting them back on, is this setup correct? Anything I should change myself or do I need a plumber to make a permanent fix?”source ↗
“Yes, replace with rigid piping.”source ↗
Where this came up
People with this problem also raised
- 4How to fix a sink drain pipe that is too short
- 2Converting a bathtub to a shower with a 1 1/4 inch drain
- 2How to connect new pipes to obsolete plumbing materials
- 2What replacement material should I use for a corroded pipe nipple?
- 2What size pipe do I need when combining two 3-inch pipes?
- 2Will twisting a trap cause toilet water to clog my shower?