Toto fill valve keeps going and hissing

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I have a couple toto st 743 e, and on one of them the fill valve keeps going after it’s full.

https://www.youtube.com/watch?v=7MtwnpJfCB8

I’ve looked at some youtube videos. One suggested to clean it, and I’ve done that. I got as far as

  • taking off the clipped hose
  • taking off the green cap
  • twisting the the next part till the plastic piece with hose came off
  • gotten the pipe thing out with a green insert
  • Cleaned all those items
  • Let some water through without the items, holding a cup over it.

But the result is no difference, it keeps hissing, keeps letting in water.

Is this fill valve a goner or am I not looking at the right thing?

If I have to replace it, how do I know the right one to order?

submitted by /u/moustachedelait
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