Why does my toilet still leak after replacing the seal?
New gaskets, supply lines, and replacement rings often fail to stop leaks because overtightened nuts, stuck shutoff valves, and tricky pressure points create new gaps. This constant trial and error leaves people anxious that they have made the plumbing worse instead of fixing it.
What people tried
Every workaround mentioned in the threads below. We haven’t tested any of them — and nobody here is claiming they worked.
- 1Attempting to tighten loose floor bolts
- 2Trying to diagnose the leak independently
- 3Considering hiring a specialized plumber, handyman, or home improvement service provider
- 4Replacing the supply line with a longer hose to allow a gentler loop and reduce strain
- 5Checking for and fixing cross-threading issues
- 6Using Teflon tape on the threads
- 7taking it off, inspecting the threads on both ends, and seeing if they're still intact
- 8reseating the rubber washer inside that bottom nut
- 9Trying different variations of rubber and metal washer placements
- 10Replacing all gaskets including the bolt assembly gaskets
- 11Checking the owner's manual for correct assembly instructions
- 12Investigating whether the tank is sweating due to humidity and cold water
In their words
Unedited, most upvoted first, each linked to the thread it came from.
“water sprays everywhere when I turn the water back on. Water sprays some the bottom end of the connector and not the top where an O ring will fix it.”source ↗
“Water is spraying from the bottom end as I circle in the picture after attaching and turning the water back on”source ↗
“I panicked and tried to diagnose it myself and in doing so found that one side had a pretty loose nut so tightened it.”source ↗
“We have never turned off the toilet valve and from perusing this group it looks like a recipe for disaster to turn it off and try to replace the wax ring ourselves.”source ↗
“I do think I could do all that but I’m very anxiety prone and will always think I screwed something up..”source ↗
“the seal between the bottom of the T-split and the water supply line has been leaking once the tank fills up and it comes to pressure.”source ↗
“I replaced the original line with a new one, as the gasket was crumbling and had the same issue.”source ↗
“I bought a Fluidmaster Click Seal, which is supposed to audibly click when the seal is made, well, it clicked, but now the leak is even worse.”source ↗
“Have been struggling to mend a leak from the right side tank to bowl bolt assembly for the past 3 days. Have been through 3 kits and end up with the same result.”source ↗