Holmes Humidifier TPU Water Tank Stop Valve Gasket
thingiverse
Replacement gasket for a Holmes humidifier water tank stop valve. I don't have the model number handy, but if it resembles the one in the attached picture, then it should fit perfectly. It might also work with other models. The part isn't available through the manufacturer, so this will save you from buying another unit altogether. It measures 23mm across, which is roughly nine-tenths of an inch.
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