Part Numbers: 0020197555. 1 xFlow Sensor (Part No. 0020197555). Glowworm Boiler Flow Sensor. Easicom 2 28C (GC No. 47-019-23) – 2015 Onwards. Easicom 3 28C (GC No. 47-019-51) – 2017 Onwards. Essential 28C (GC No. 47-019-28).
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