Tucked away in the brewing group of your espresso machine is the Head Seal. This is a pretty important part as it provides the watertight seal between your handle and the group. This rubber seal perishes over time as a result of the hot water, coffee grinds and endless use.
Head Seal fits all The Rocket E61 domestic espresso machines. Caution: Never change the Head Seal on a warm espresso machine ... it hurts!