Brewer's Airlock
thingiverse
Quick and dirty airlock. Printed in two halves, glued together with silicone, holes for optional screws. Hose barb on the airlock is 10mm outside diameter. Hose barb on the cap is 4mm outside diameter. I designed this to be printed in two halves for my Monoprice Mini Delta but included an STL for both halves to print at once. The cap is because I decided later that I wanted to attach a hose to the top and didn't want to redesign the whole body. I glued it on with silicone also. Could this be better? Yes. Could this fit your needs just fine? Also yes. SketchUp files included in case you want to modify. :-)
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