I have a 10 year Vitodens condensing boiler system I installed 12 years ago. The boilers are WB2A 15-60 units. I had to go with a 2 pipe vent system and used Fas-n-seal stainless steel venting. After 12 years the gaskets on a feel of the pieces have broken down and condensation is dripping out of a few joints. I have decided to replace the leaking fittings and adapt to PP venting materials. Today I attempted to replace the venting materials and when I installed the 4" PP pipe into the boiler 2 pipe adapter, I found that 4" PP pipe or 100 mm was too small for the 2 pipe adapter which I believe is 102 mm (according to the Viessmann venting manual. I really don't have any options other than use some RTV sealant? what do you guys think.
Thanks Jeffrey
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