Features: 154mm Silicone Steam Ring: It has good elasticity to prevent cracking high and low temperature resistance and good aging resistance. Combination gasket compatible for Breville 450 870 878 880 8 series coffee machine. 2Last Longer: Clean cut and just the right 54mm steam ring is made of silicone material which is easy to remove and easier to install it is more durable more resistant to high temperature than ordinary rubber gaskets and has a longer lifespan. 3Excellent Sealing: No BPA grouphead gasket replacement part soft silicone fits into grooves very easily resulting in a tight and secure fit that seals to ensure no moisture escapes while minimizing necessary changes frequency. 4From Cold To Hot: Our silicone steam ring stands well against constant exposure to extreme temperatures. It can handle a range of as low as 65F / 54C to as high as 450F / 230C. 5Kitchen Essentials: Silicone gasket is a must for life and kitchen and any set of gaskets needs to be replaced so having a spare steam ring on hand is essential. Specification: Item Type: 54mm Silicone Steam RingMaterial: SiliconeWeight: Approx. 15g / 0.5ozSuitable: For Breville 450 870 878 880 8 Series Coffee Machine Etc. Package List: 1 x 54mm Silicone Steam Ring