My existing toilet supply line connection was old and started to leak a little when I messed with it in order to install a bidet.

It started leaking at the connection with the toilet. So I bought a replacement toilet connector, but the screw cap is too big and there's only a small gap between the toilet and the plastic screw hose.

I noticed on the old connector it seems someone manually cut the plastic around to make it fit.

What I find strange is why isn't there enough space? Is the toilet setup wrong? I feel there should be more space?

Anyways, does anybody have an idea what I can do to make it work?

Here's a picture of how small the gap is:

small connector gap

From another angle:

small gap alternate angle

Here you can see how the old connector on the left they had clipped the plastic to fit. And my new connector on the right which I don't think I can fit doing the same:

old and new connector

  • 2
    Newer connectors they try to make “tool free,” and as a result, they’re larger to more easily grip with your hand. A plumbing supply store will almost certainly be able to provide an alternative.
    – Tim B
    Jan 9, 2022 at 5:04
  • While you're at it, you may want to take a razor blade and scrape the grout off the tile surfaces. Just to tidy things up a bit.
    – FreeMan
    Aug 26, 2022 at 14:26
  • Install an extension and couple to that. A standard galvanized coupling and a matching nipple should do the job (though you may be able to find brass or plastic pieces that would resist corrosion better).
    – Hot Licks
    Sep 1, 2022 at 20:53

4 Answers 4


You can easily remove the tank from the bowl(after draining all water), snugly attach the supply line, trim if necessary, reattach tank to bowl. Should be good for as long as you live there

  • Respectfully, I have never had any toilet valve last for as long as I have lived anywhere.
    – jay613
    Aug 26, 2022 at 15:27

Problem seems to be the plastic nut being too thick.

Option 1: get a flex line with a metal nut, which will be thinner than the plastic one.

Option 2: get one of these extenders, and screw your plastic nut flex on it.

enter image description here

Option 3: if that still doesn't fit, cut the plastic thread shorter (or add a nut on the other side to push more thread into the tank) so the nut is in a spot where there is more clearance with the toilet. If you cut it, then the end will not be smooth so you have to use the extender and teflon, not a joint.

enter image description here

Option 4: If the extender would fit but you cant' turn it because the angles of the nut bump into the toilet. Separate the tank from the toilet, screw the extender, put the tank back in.

When screwing metal on plastic threads, do it gently.

  • 1
    Covered all the options here, well done plus 1.
    – Solar Mike
    Jan 9, 2022 at 9:09
  • Belt and suspenders! lol
    – bobflux
    Jan 9, 2022 at 15:52

You can buy a flush valve with a longer threaded connector. They exist. They won't be in the cheap-plastic-toilet-parts department at the hardware store, they will be at the plumbing supply.

I would prefer this solution to ones requiring the tank to be removed from the bowl, because valve replacement is one of the most common maintenance tasks whereas removing the tank from the bowl is usually not needed in the lifetime of a toilet. So why make the latter a requirement for the former?

Another less common maintenance task is removal of the toilet to deal with stubborn clogs. Similarly, why make separation of the tank from the bowl a requirement for that task?


I had this issue and used wire cutters to cut the protruding parts of the nozzle. It worked and I was able to connect without having to get an adapter or remove the tank. Just another option in case there are others having this frustrating issue.

  • This is already listed as an answer.
    – JACK
    Sep 1, 2022 at 21:55
  • Using wire cutters to trim a nozzle must have been quite a feat! Also, I guess you decided not to go the extender route that you'd asked about in your other, now deleted "answer". Glad you got this working, but it's still an answer that had been mentioned previously, as JACK noted. Please take the tour and look through the help center section on How to Answer to learn how this place is different from other forums where these kind of responses are acceptable and why they're not here.
    – FreeMan
    Sep 2, 2022 at 11:45

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