Key benefits Improves espresso quality by enabling fresh grind and proper extraction with compatible machines Durable full stainless steel 51mm portafilter with three ears for secure locking and reliable performance Includes a 51mm nonpressurized doublecup filter basket (2cup capacity) that holds up to 16 g of ground coffee Clear compatibility guidance helps you verify fit before to avoid mismatches Designed to work with common 51mm portafilter machines and several CM5418, 3700 Essential, 3700 Pro, Espresso and Cappuccino models, and certain other espresso machines What makes it stand out 51mm size with three ears, each about 4 mm thick, offering stable seating in compatible machines Nonpressurized basket supports standard doubleshot brewing with measured coffee amount Built to withstand regular use with stainless steel construction and precise manufacturing Useful tips for results Use fresh coffee beans and grind just before brewing Grind to a finer setting for extraction Avoid too coarse a grind, insufficient ground coffee, or light tamping pressure, as these can lead to inadequate brew pressure For a double shot espresso, use 15–16 g of ground coffee Compatible models and fit This portafilter is designed for models including CM5418, 3700 Essential, 3700 Pro, Espresso and Cappuccino machines, and certain other espresso machines In general, if your machine uses a 51 mm portafilter with three ears, each approximately 4 mm thick, this portafilter should be compatible Verify your portafilter dimensions before to ensure proper fit Double Cup Filter Basket included 51 mm nonpressurized filter basket 2cup capacity, holding up to 16 g of ground coffee Compatible with machines that use a 51 mm portafilter with three ears Use scenarios Home barista pulling a true double shot: Use fresh beans, grind fine, weigh 15–16 g, and tamp firmly to achieve the recommended extraction pressure on a CM5418, 3700 Essential, or 3700 Pro, or compatible Espresso/Cappuccino machines Preparing milkbased drinks: After pulling a double shot with the included basket, steam and texture milk for cappuccinos or lattes on compatible machines Office or shared café setup: Easily or upgrade a worn portafilter on machines that match the 51 mm threeear standard, maintaining consistent brew quality across sessions Specifications and compatibility notes Portafilter material: full stainless steel Size: 51 mm diameter Ears: three, each approximately 4 mm thick Basket: 51 mm, nonpressurized, 2cup capacity, up to 16 g of ground coffee Compatibility: CM5418, 3700 Essential, 3700 Pro, Espresso and Cappuccino machines, and certain other 51 mm portafilter models with three ears Important usage reminder Always verify that your espresso machine uses a 51 mm portafilter with three ears before to ensure proper fit and performance