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The retaining clips that hold the part which lift the rubber valve to allow water to go down broke.
They do not sell the replacement parts at the local hardware store, only the whole set, which cost around $67
this is a replacement for that.
+1mm version has the circular bit that seals against the rubber seal, 1mm bigger in diameter compared to OEM. (in case the OEM dimension leaks )
FreeCAD design files included.