What is a B2 Connector when talking aboutradiators?

Question

Just looking at a new radiator and it states is a "B2 connection". Plumber is doing well at avoiding calls so can anyone help?

Thanks,

Claire

Answer 1

B2 means that the radiator can only be connected using the bottom outlets, one each side on a standard 1/2" gas thread as against say, top inlet one side, bottom outlet other side.(TBOS) (Top, bottom, opposite side.) Usually the cheaper radiators have a fixed air bleed valve and no radiator cover so can only be connected from the bottom.