Zoom icon Click to expand Tap to zoom Chevron down icon Chevron down icon La Marzocco GB-5/FB-80 Steam Symbol Valve Knob Insert by La Marzocco Save Liquid error (product-badge line 32): -Infinity% $4.00 1 2 3 4 5 6 7 8 9 10+ Quantity Chevron down icon Quantity Add to cart Spinner icon Notify me when back in stock Email address Email me when available Plastic threaded insert for the front of the GB5 and FB80 steam valve knobs.