This set of silicone O-rings wear out during use of your fully automatic coffee maker. These rings are located on the "filling spout" or "boiler pin" at the connection between the machine and the brew group. During each cycle (every time the brew group turns) the inlet of the brew group slides over this spout. Over time, these O-rings wear out and the machine starts to leak. You will notice this because, while making coffee, more water enters your drip tray and therefore there is less and less coffee in your cup. Sometimes no coffee comes out at all, but all the water leaks away. Water may also come out from under your machine and steam may come out of the ground coffee filler neck. It is easy to replace the O-rings yourself. The O-rings will last longer if you regularly lubricate them with a very small amount of (food grade) silicone grease.

The silicone O-rings are supplied per set, so 1 of the larger size (see the yellow circle in the photo) and 1 of the smaller size (see the orange circle in the photo).