Breville Sage Cafelat Group Head Gasket Silicone 58mm SP0001635 BES920 BES900 BES980 for units 58 mm, in blue silicone suitable for Breville coffee machines model THE DUAL BOILER Unlike regular gaskets that are made from rubber these do not have any smell or taste whatsoever, and are easy to change since they will not bake rock hard like rubber does. If you have ever struggled to change an old gasket you cannot help but notice the awful smell and the black soot that comes off the rubber. And that is what you are potentially consuming with each drink. Therefore, carry out the correct maintenance in time. Please note that although the gaskets are strong under compression, you should never use a sharp tool like a screwdriver to install them. This may tear the silicone. This Tune Up Kit Will fit Breville models and equivalent SAGE models BES900XL BES920XL BES980XL BES990