Vaillant ecoTEC Plus 637 837 937 Gas Valve with Regulator 0020148383 New Genuine
Part Number: 0020148383. This part fits the following Vaillant boilers Genuine Vaillant spare part. Ecotec Plus 637 VU 376/5-5 2012-2012 41-044-65. Ecotec Plus 637 VU 376/5-5 A R4 2015 Onwards 41-044-85.