La Marzocco Linea PB Steam Valve Knob – Genuine OEM Replace a cracked, broken, or worn steam valve knob on your La Marzocco Linea PB with this genuine OEM replacement. The steam valve knob controls the steam valve that opens and closes steam flow for milk frothing — a damaged or worn knob makes it difficult to control steam output precisely, affecting milk texture and latte art consistency. Specifications SKU: LM-KNOB-PBSTEAM Type: Steam valve knob Genuine OEM La Marzocco part La Marzocco part number: F.1.034. Compatibility La Marzocco Linea PB Symptoms of a Faulty Steam Knob Knob is cracked, chipped, or broken Knob spins without engaging the steam valve Steam valve is difficult to open or close smoothly Imprecise steam control affecting milk frothing Frequently Asked Questions Is this a genuine La Marzocco part? Yes, this is a genuine OEM La Marzocco Linea PB steam valve knob. Can I replace this myself? Steam knob replacement is generally a straightforward task — the knob typically pulls or unscrews from the valve stem. Ensure the machine is off and cooled before starting. If you need assistance, our Sydney-based technicians can help — contact us to book a service. Is this the same knob as the Linea Classic? No — the Linea PB uses a different steam valve knob to the Linea Classic. Ensure you select the correct knob for your model before ordering.