When your ears grow the tube get too small or it gets to stiff you need to replace it so this is how you replace your tube at the bottom of the tube you need to make a arrow with the tube so what I mean is is you cut a bit of it like so it is a half of a tube vertically but only the bottom bit the thread it through the mould until it is in then pull it through until it is to the bend of the tube then cut off the bottom bit of the tube then look at a different part of this website bye
https://www.amazon.co.uk/s?k=hearing+aids+tube&i=instant-video&ref=nb_sb_noss_2
these are tubes for you hearing aid batter
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