As an Amazon Associate, we earn from qualifying purchases. Home » La Marzocco » MZ_527 La Marzocco 'GB-5/FB-80' Steam Symbol Valve Knob Insert La Marzocco . MZ_527 Gallery Attributes Brand name, Manufacturer name, ManufacturerLa Marzocco Extra Product NameLa Marzocco 'GB-5/FB-80' Steam Symbol Valve Knob Insert moq, multiple, tierMinQty11 MPN, SKUMZ_527 qtyInStock0 snippetPlastic threaded insert for the front of the GB5 and FB80 steam valve knobs. tierPrice12.97 Distributor offers SellerSKUMOQIn stockMultiplePrices espressoparts.comMZ_527111 @ $2.97