As an Amazon Associate, we earn from qualifying purchases. Home » La Marzocco » MZ_529 La Marzocco GB5/FB80 Steam Valve Knob Grub Screw (Special Order Item) La Marzocco . MZ_529 Gallery Attributes Brand name, Manufacturer name, ManufacturerLa Marzocco Extra Product NameLa Marzocco GB5/FB80 Steam Valve Knob Grub Screw (Special Order Item) moq, multiple, tierMinQty11 MPN, SKUMZ_529 qtyInStock-2 qtySourceFieldMap tierPrice16.60 Distributor offers SellerSKUMOQIn stockMultiplePrices espressoparts.comMZ_5291-211 @ $6.60