1. WIDE COMPATIBILITY: 54mm silicone steam ring compatible with breville espresso machines 870/878/880/860/840/810/450/500/ Sage 500/810/870/875/878/880 No BPA grouphead gasket replacement parts 2. FOOD GRADE SILICONE RING: For Breville/Sage espresso machine compatible silicone gasket is made of food grade silicone, BPA free, easy to remove and install, and more resistant to high temperatures than ordinary rubber gaskets. It can handle temperatures as low as -65??F/54??C to as high as 450??F/230??C 3. EXCELLENT SEALING: Our 54mm silicone steam ring fit perfectly with Breville/Sage coffee makers, and the soft silicone fits easily into grooves, creating a tight and secure seal that ensures no moisture escapes while minimizing the need for replacement frequency 4. A MUST-HAVE FOR COFFEE LOVERS: silicone replacement gasket seals are a must in life and in the kitchen, and any set of gaskets needs to be replaced, so having a spare steam ring on hand for coffee lovers is a must. Our silicone rings are more effective at preventing the growth of harmful elements than regular rubber gaskets. you can use it for a long time