Key benefits Provides a reliable replacement blind filter basket for routine maintenance and backwashing, protecting your machine and preserving extraction quality. Durable stainless steel construction resists rust and wear for long service life under repeated cleaning and use. Universal fit for common portafilter sizes (51 mm, 54 mm, 58 mm), reducing the need for multiple spare parts. What this part does Nonpressurized blind filter cup designed for automatic espresso machines that require a blind (closed) filter basket. Used to safely close the portafilter during backflush and pressurerelease procedures so cleaning detergent and pump pressure can flush the brew circuit without damaging components. Features and specifications Compatibility: fits general 51 mm, 54 mm, and 58 mm portafilters. Material: stainless steel for corrosion resistance and durability. Design: nonpressurized, blind (solid) filter cup intended specifically for backwashing and maintenance routines. Installation: tool, quick swapin/out for fast grouphead servicing. Cleaning: smooth stainless surface minimizes coffee oil buildup and is easy to rinse or soak as needed. How it solves common problems Prevents improper cleaning: provides a proper blind basket for backflushing so detergent and pressure reach group seals, valves, and lines. Reduces downtime: fast, tool installation lets café staff or technicians the machine to service quickly. Extends component life: correct backwashing reduces scale and oil deposits that can impair valves and pumps. Practical use scenarios 1) Daily café backflush: insert the blind cup into the portafilter for scheduled backwashing to keep group heads, valves, and shower screens clean. 2) Service and troubleshooting: technicians use the cup during pumppressure tests and maintenance to isolate and flush the brew circuit safely. 3) Home or office automatic machines: owners who perform routine maintenance can use this blind filter cup to perform proper backflushing without improvising parts. What to expect A solid, stainless steel blind filter cup that fits standard 51/54/58 mm portafilters, installs easily without tools, and supports effective backwashing and machine hygiene.