Stainless steel mushroom, nut, and gicluer for the Izzo, Quick Mill, and Rocket espresso machines. This is also compatible with the Vesuvius, and any machine that sports an E61 group. While purchasing the new E61 stainless steel mushroom you should purchase a new o-ring for the bottom of the mushroom, this helps it seal.
14mm allen wrench required in order to remove the mushroom stem to replace the valve stem and o ring.
2nd photo is what a NON stainless steel mushroom looks like over time when the chrome plating starts to peel.