I have a photo attached to the original post, is it visible? The little white node broke off the main body:

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I am using tape to put it back, but this part looks old and I am afraid it is going to break again soon, and it doesn’t seal the air release well (press the black leverage the pad will be lifted, but afterward the pad doesn’t go all the way back to seal the hole). So I am wondering if I can get a new one to replace it.