Viessmann Ionization Electrode With Gasket For Vitodens 200 W Wb2B 19/26/35 Series Boilers. Compatible with Vitodens 200-W WB2B 19/26/35 Series Residential Wall-Mounted Gas-Fired Condensing Boilers Any adjustments installations service or maintenance must be completed by a licensed professional heating contractor who is qualified to work with hot water boilers Check with manufacturer before ordering replacement parts to ensure a proper fit Give the manufacturer the 16-digit boiler serial number or the 12-digit ASME/NB serial number Package Contents: Viessmann 7834234 Ionization Electrode With Gasket For Vitodens 200 W Wb2B 19/26/35 Series Boilers Viessmann 7834234: Ionization Electrode With Gasket For Vitodens 200 W Wb2B 19/26/35 Series Boilers