Bosch SPS40C12GB Repair Instructions page 111

Repairs
6.30.2 Installing the drain check valve
1. Push the drain check valve with the marking pointing upwards (2) into the
connecting pieces (1) until they audibly click into place twice.
2016-03-02 / DIS 840_58300000176874_ara_en_c
2. Push the connection hose into the connecting pieces of the sump.
3. Press the connection hose into the holder.
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