servicing this item
The caps in the middle of the knobs remove them and you will be able to remove the knobs then there are two screws holding the cover plate on remove the screws and cover plate then there are two screws holding the black cover on which is the gearbox cover
the only real difficulty is removing the temperature control cover (It looks like a Rocket) there are two retaining screws in the tail of the rocket remove this and that lets you into the temperature cartridge.
Answered 5 years ago by George Thomson
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Trevi Therm - Pre 1997 (Red Override Button)
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