Rancilio Composite Paper Heating Element Gasket
This should be used with equipment that is really old, or is suspected to be warped or otherwise damaged: the paper material is very forgiving on questionable surfaces, unlike the PTFE version gasket. It should be noted that this type of gasket can be very difficult to remove after it is compressed for a long period of time. 63 x 48 x 2 mm. Discontinued by Rancilio.