The dust caps provided for the top of the airlocks did not have vent holes. I had to add them myself with a pin. (Hence one star for ease of use.) After that, they work great. Note. If you have a wide-mouth bottle such as B. use a bottle, the supplied silicone stoppers are too small. Fortunately, eyelets are also included in the kit. So as soon as you drill a 1/2" hole in the container lid for the jack they will work just fine that way. (I've since received several bottle-sized corks from another seller.)
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