Ceramic valve insert and backflow preventer
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There are many versions. Some also have the addition of Cosmopolitan. The model 34 155 is shown. There are extensive PDF lists available online with spare part numbers and exploded view drawings.
The core components—ceramic headpart, thermostat cartridge, and non-return valves—are often the same; the handles and how to remove them differ. Since everything is plastic, be careful here if the mechanism is unknown and do not apply excessive force, otherwise the plastic will break easily.
