A replacement silicone group gasket for La Spaziale espresso machines. A common wear and tear item, the group gasket is one of the easiest items to replace on your espresso machine. If you seeing leaking around group portafilter while under pressure chances are you need to replace your group gasket. This silicone group gasket lasts much longer than the hard, or soft, rubber gaskets that are commonly found by default when you receive your machine.