La Marzocco Momentary Hot Water Switch This momentary-action hot water switch is pressed down to run and releases automatically back to off - it replaced the earlier square E.1.008 switch that La Marzocco discontinued for reliability reasons. COMPATIBILITY Fits: La Marzocco machines using this momentary hot water switch Replaces: on GB5/FB80 built after serial #843, this replaces the earlier square switch (E.1.008 / MZ_340) Works with: a wiring adapter if your machine was originally wired for pin connections INSTALLATION Straightforward electrical swap, though GB5/FB80 owners upgrading from the old square switch will need the wiring adapter above. PRO TIPS If you're upgrading a GB5 or FB80 built before serial #843 from the old square E.1.008 switch, don't just swap the switch - you'll also need the wiring adapter, since the old units were wired for pin connections that this momentary switch doesn't use directly.