Gaggia Lever group rubber seal
Rubber seals for Gaggia Lever groups. You replace all the white fluffy gaskets inside the group with a stack of 4 rubber seals and brass rings for a much more reliable system. But you probably knew that already which is why you are here!
Gaggia Lever Group Brass Ring: http://www.cafelatstore.com/products/gaggia-lever-group-brass-ring