Part number: 0020118178 – flow switch / flow turbine for Glow-worm combi boilers. Boiler compatibility (UK): Betacom 2 24C (GC 47-019-16), Betacom 2 28C (GC 47-019-17), Easicom 24C (GC 47-019-18), Easicom 28C (GC 47-019-19). Purpose: Senses water flow to enable safe ignition and correct hot-water operation. Direct fit: Designed to match original connectors and seating for quick replacement. Install note: Must be fitted by a qualified Gas Safe engineer; isolate power/water before work., Manufacturer: Glowworm