One of the most important things, but also one of the most maintained items, is the portafilter gasket. This portafilter gasket is used to seal off the portafilter against a rubber surface, which prevents leaking from the outside of the portafilter. The portafilter gaskets found on this page are not made from the standard NBR, but from the material Silicone. You will find them in various colours instead of black and have a advantage that they do have to be replaced less then the standard versions.
There are various sizes and types for portafilter gaskets, this depends on the brand of espresso machine and the model of brewing group used. Seen not every brand uses 1 type of brewing group. There are also small differences between the OEM/original portafilters and aftermarket. This is a thing of dimensions and not of quality.
When do you know when the portafilter goes bad?(yes this is also the case with silicone When the water comes from the top of the portafilter
It is also possible that your portafilter still leaks when you replace it with a new portafilter gasket. Then it is possible that or your portafilter ears are worn down or the clamping ring. You can solve this by adding spacers or thicker portafilter gaskets. But when you replace your portafilter and have installed a thicker portafilter gasket, your portafilter won’t fit in the brewing group. So when you replace your portafilter it is also handy to replace the portafilter gasket.
