OPV (Over Pressure Valve) - to adjust brew pressure, not standard on the Oscar for some reason! This is set to around 10 bar but can be adjusted. The process is a bit of a faf due to the location.
Vacuum breaker allows use of the machine with a timer / wi-fi plug. Without this the steam wand should be opened on startup to equalise pressure in the boiler.
Giglers restrict water flow through the thermosyphon, these are omitted from the Oscar but present on the musica - this just helps a little with thermal stability.
@aled I'm in Stroud tomorrow, early evening, and am happy to bring the machine as far as Coventry for the buyer if that helps them to work out the sale with you.
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