This silicone O rings set ensures perfect for J7 / J9 coffee machines, leaks and bubble for efficient milk frothing and a professional coffee Perfect for home kitchens during breakfast, busy coffee shop mornings, or social gatherings to deliver consistent, flavorful coffee in any setting Made from premium food grade silicone, it withstands up to 15bar pressure and high temperatures, offering durability by over 1000 cycles and easy installation for easy maintenance Ideal for coffee shop professionals, home baristas, and coffee enthusiasts who demand accessories for their machines to enhancing daily brewing routines This silicone accessory improves coffee flavor while ensuring long term