I replaced the innards of my toilet with something like this, all went well. The toilet works, etc. It involves undoing the water pipe, replacing insides of toilet, then screwing the water pipe back together. I had no problems, but after finishing everything up I'm still getting a small drip from the pipe (underneath toilet base, near shut off valve).
The instructions say to only tighten the plastic pieces by hand, I've done that as much as I can. But there's still dripping from the piece that connects the toilet and the pipe.
Any tips? The instructions make it clear not to tighten with tools or use sealant. It did not drip before I unscrewed it and put it back, and there was no sealant. Do I just need to tighten it more?
Edit: Here's the pipe, it's not plastic sorry. The top black piece is new and came with the parts I bought, the bottom piece is old.