I know what your talking about, I tried finding one for myself because I have hemorids. I checked the two local medical supply stores and they did'nt have them. So my need being great, I went to a local tire store that sold tires and tubes for four wheelers. I purchased a tube, I don't remember the size but it works great. I can say that I am "on the tube" while I watch the tube (tv)
Good luck on your search.
Peace
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