drain

[gbutch]

going to re-tile bathroom floor but thinking about putting a condensate drain in for future new boiler while i still have access to get under floorboards.
but what dia.pipe should go in?

yours gb

 

[powell30]

plastic abs. comes as 21.5mm for some reason! Just treat as 22mm for connecon to existing stack/drain. Rubber 32/22mm or 40/22 reducers are available to connect to modern stack connection points (or drill and use a collar)