Round copper gasket LF L1186186

A round copper gasket creates a pressure-tight seal between the portafilter and the group head of an espresso machine. When the portafilter is locked into place, the gasket compresses slightly, filling microscopic gaps that would otherwise let steam and water escape. This compression ensures the high-pressure water needed for espresso extraction is directed through the coffee puck rather than leaking around it, maintaining consistent brewing pressure and preventing scalding steam from reaching the barista.

To install the gasket, the portafilter is removed and the old gasket is pried out of its groove in the group head. The new copper gasket is pressed into the same groove, ensuring it sits evenly without twisting. Once seated, the portafilter is reattached and tested with a blank shot to confirm the seal holds under pressure. Over time, the copper softens and conforms to the shape of the group head, improving the seal with use.

The gasket is made of copper, a material chosen for its malleability and heat conductivity. Copper deforms under pressure to fill imperfections in the metal surfaces it contacts, while its thermal properties help maintain stable brewing temperatures. The dimensions of 23 mm outer diameter, 17 mm inner diameter and 3 mm thickness match the standardised groove found in the group heads of the listed professional espresso machines.

This gasket fits a wide range of commercial espresso machines, including models from ASTORIA CMA, CIMBALI, CONTI, ELFRAMO dishwashers, ESSIKA, FAEMA, LAVAZZA vending machines, MCE, ORCHESTRALE, RANCILIO and WEGA. Specific models are listed in the product details to confirm compatibility before installation.

Regular replacement of the gasket is part of routine maintenance for espresso machines. As the copper wears and loses its ability to seal effectively, extraction quality declines and steam leaks become more frequent. Replacing the gasket restores the original pressure integrity and extends the life of the group head by preventing steam erosion of the metal surfaces.