Replacing the Nespresso CitiZ pressure relief valve

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In the first picture, the pressure relief valve is marked in yellow. It is located at the bottom of the machine. It is connected directly to the heater.

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Pull out the two metal clips on the connections.

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First remove the two connections on the clamps. Each connection is sealed with an O-ring. Those usually get stuck in the pressure relief valve. Replace those with new ones when reassembling.