I just discovered that .25" shrink tube fits the inlet nipple of the SDS011. Prior to this i used a .25" ID automotive tubing, which had a thick wall and which I had to wedge in against the circuit board. And so it fell off.
the .25" shrinkfit works perfectly, even without heating. Now to find a cheap 90degree angle that is .25" OD.
Remember that the SDS spec sheet calls for [gravity] fan side down. Remember that the spec allows a fairly long tube but they suggest black, which absorbs light. I have not exceeded 10cm tubing length.