Review on Two-stage filter ABF-2 3/4 by Micha Skolimowski ᠌

Rubber ring seat seems to have been designed by aliens. Between the rubber band and the end of the bulb (in a twisted state) there is a small ledge made of blue plastic, which does not allow the rubber band to be squeezed by this very end (and makes it difficult to remove the rubber band from its seat, why?). Those. The flask resting on this ledge does not squeeze the rubber band tightly enough to prevent water leakage no matter how tightly you tighten the flask. To address this issue, I simply layered another rubber ring on top of the first (in castorama = 39 / piece, ring diameter 90mm).