Compatible 54mm rubber backflush cleaning disc for Breville espresso machines including the Barista Express (BES870), Barista Pro (BES878) and Barista Touch (BES880). Used for backflushing the group head — the most important regular maintenance task for your espresso machine. Backflushing removes coffee oils and residue from the solenoid valve and group head that builds up with every shot. How often to backflush: Weekly for home use, daily for high-volume machines. How to use:1. Insert the blind disc into your portafilter basket2. Add a small amount of espresso machine cleaner (optional)3. Lock the portafilter into the group head4. Run 5-6 short 10-second cycles5. Remove and rinse thoroughly Regular backflushing keeps your espresso tasting clean and extends the life of your machine's solenoid valve. Pair with a group head gasket replacement every 6-12 months for a complete service. Got the gear? Don’t forget the good stuff. Grab our bestselling espresso beans to go with it - add on the Espresso Starter Pack to try three different brews or the all-star Meebz Blend.