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Steam and hot-water valves
Two valves, one rebuild kit
La Marzocco's manual says not to attempt repairs: any repair must be done by La Marzocco or an authorised centre, using original parts, and the warranty is void for components tampered with or repairs by unauthorised people. Treat this as authorised-centre work.
The same valve (B.2.040) serves steam on the right and hot water on the left, and one rebuild kit (B.1.012.R) covers both. La Marzocco's checklist fits it every 2 years. No step-by-step method from La Marzocco or a retailer was found, so none is given.
The wand is held by a 27 mm fitting with a PTFE gasket. Each knob is held on its stem by a clip; owners report a knob that spins freely when the clip falls off.