This Fermzilla replacement lid ring is great for homebrewers and small - scale commercial brewers. You can use it during the fermentation process to seal your FermZilla fermenters, uni tanks, or bright tanks. It fits multiple FermZilla models including 27L and 55L conical fermenters, flat - bottom tanks, and bright tanks. It's made from high - quality glass - reinforced engineering plastic which makes it durable and long - lasting, ensuring a good seal for your brewing needs.