Group Head Gasket & Shower Screen for your Rancilio Silvia, they will need to be replaced every year and depending on how much you use your machine and how clean you keep it. You will see both in the image.
This is a handy brush to help prolong the life of your gasket, you use it to clean the group head gasket from time to time. http://www.homecoffeemachines.ie/products/group-head-cleaning-brush
You Should also be descaling your Silvia regularly with descaler.
Please note that we do not supply you with a new screw as your existing one will be fine to re-use.
This video will show you how to replace the Gasket and Screen.