Vaillant Fan Proving Air Pressure Switch 0020018138. Part No.0020018138. THERMOcompact 615 E VU 152/2-5 (GC No. 41-044-23). THERMOcompact 615 E VU 152/2-5 R1 (GC No. 41-044-23). THERMOcompact 615 E VU 152/2-5 R3 (GC No. 41-044-23).
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