As an Amazon Associate, we earn from qualifying purchases. Home » La Marzocco » MZ_532 La Marzocco GB5/FB80 Steam Valve Knob Stop Screw La Marzocco . MZ_532 Gallery Attributes Brand name, Manufacturer name, ManufacturerLa Marzocco Extra Product NameLa Marzocco GB5/FB80 Steam Valve Knob Stop Screw moq, multiple, tierMinQty11 MPN, SKUMZ_532 qtyInStock0 snippetM6 thread. tierPrice111.00 Distributor offers SellerSKUMOQIn stockMultiplePrices espressoparts.comMZ_532111 @ $11.00