General description This 51MM Coffee Bottomless Portafilter is designed for use with the EC9335, EC9665, and EC9155 espresso machines. Its bottomless design allows for better observation of the coffee extraction process, helping you achieve the perfect brew. Technical specifications Diameter: 51MM Material: 304 stainless steel and ABS Color: Black and Silver Measurement allowed error: +/- 1-3cm Compatibility and accessories Compatible with EC9335, EC9665, and EC9155 espresso machines Can be used with various filter baskets Installation Detachable design for easy cleaning and storage Usage Observe the flow column, flow rate, and color during extraction for professional coffee filtering Helps in understanding grinding and tamping techniques Other information