The O.D. of F-236 is around 10.5 mm. The select comfort® tubing could not be slipped on because the tubing I.D. is around 8.5 mm. and the O.D. is around 10.5 mm leaving a wall thickness of around 3 mm. I heated it with hot water and then an electric hair-drier in order to stretch it, but it would not slip on. The tubing diameter is too thick and it wouldn't stretch enough for me.
Answer: Yes, the size you are looking for is the F-236-SMALL
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