Viessmann Gasket Flue Gas Dn60 For Vitodens Wb1B/Wb1Bc/B2Ha/Wb2B/B2Ta Series. Replacement Gasket (Flue Gas) (DN60) for select Vitodens Residential Gas Condensing Boilers Vitodens 100-W 200-W and 222-F WB1B/WB1Bc/B2HA/WB2B/B2TA Series boilers are all designed to operate with natural gas and liquid propane gas (LPG) 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 7828645 Gasket Flue Gas Dn60 For Vitodens Wb1B/Wb1Bc/B2Ha/Wb2B/B2Ta Series Viessmann 7828645: Gasket Flue Gas Dn60 For Vitodens Wb1B/Wb1Bc/B2Ha/Wb2B/B2Ta Series