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| Material | Rubber |
| Color | Black |
| Compatible Coffee Maker Type | Espresso machine |
| Part Number | 36301041 |
| Cleaning Instructions | Not specified |
Rancilio Expansion Valve Gasket This is the rubber gasket that fails inside the over pressure valve (OPV) in your Silvia. You will know that it has failed because one of the pipes in the water tank will be bubbling air constantly when the machine gets up to temperature. Product Details Once replaced, you will need a portafilter with a pressure gauge to calibrate the pressure at the group head. Genuine Rancilio part 36301041 Here is a video showing how to replace the OPV gasket, although it is in Dutch the visuals are very useful
The catalog often lists the same model at several merchants — worth a price check before you buy.