>>2770329This is how airlock usually looks like, pressure differential can be observed by looking at two water chambers.
This design can be added to any jar, just drill the lid, add a seal and put this S type airlock in.
One important thing is to never let it run dry, water needs to be refilled every so often depending on design, my low profile design needs to be refilled quite often.
Another thing I forgot to mention is to never fill your jar more than 3/4 because it'll start bubbling when fermentation starts and bubbles should never reach the airlock.
