Use with commercial espresso machines, or with semi commercial home machines provided with pressure relief 3-way solenoid valve on group head (Warning: attempting to backflush a machine without 3-way solenoid valve on the group head can cause serious damage to the unit). This universal disc fits on any 2-cup size filter basket and "plugs" the filter holes to allow thorough and effective backflushing. Use with a teaspoon of our "Clean Express" (see below) detergent for best results. Made in USA. Each disc will last for hundreds of applications. BK0005$4.00 Clean Express Detergent Copyright 1998-2008 Sovrana Trading Corporation, Gardena, CA | Contact Us. Privacy Policy | Register - Log In | Shipping Methods and Rates | Transit Time Images courtesy of respective manufacturers. Learn more about our products at our Corporate site: sovrana.com