VAILLANT ECOTEC + 824 831 837 937 DIVERTER VALVE 178978. PART NUMBER : 178978. OLD PART NO. 178978. VAILLANT ECO TEC DIVERTER VALVE. DIVERTER VALVE FOR VAILLANT ECOTEC PLUS 824. ECOTEC PLUS 831. ECOTEC PLUS 837.
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