Great tube but the internal diameter isnt listed..
Great quality and build, length wise its exactly what it says it is but the listed diameter was actually the outside and didn't account for tube thickness so its a touch smaller than I was expecting. Works great with the accompanying pump and the thick rind at the base makes sure it isnt pressing into me too hard.
Bought this product, but when received my existing pump did not fit in the connector in the top with the smallest gap. As well as the tube is not 1.75 the whole way but gets narrower near the top.
Honest review: Good Quality but would recommend getting matched pump to fit so it creates a vacuum.
