FermZilla Conical O-Ring Kit

This thicker Lid O-Ring is suited to FermZilla Conical and All Rounder Models. All future models produced after 25/12/2019 will have these O-Rings as standard.
It is also important to remember not to overtighten the stainless steel handles that may have come with your FermZilla. Over tightening will cause the opening to warp and not seal. The Handles should be able to freely rotate around the neck with little resistance.