Group Head

Short description:
The component of an espresso machine where coffee extraction occurs; it holds the portafilter in place.

Long description:
The group head or "extraction head" is the part of an espresso machine (coffee maker) where extraction occurs. It holds the portafilter and ensures that water passes evenly through the ground coffee. This component is often made of metal for optimal temperature distribution and must be cleaned regularly to maintain the quality of the coffee.