A new contribution to the mechanistic explanation is the findings in a similar case with press
fitting corrosion examined by P. Møller. These data are from an apartment building from the
major city described in cases 1-3 and occurred in the same time frame. In this case rust stains
appear after < 2 years of service and crevice corrosion was observed. Corrosion products
inside the crevice under the o-ring revealed high concentrations of Mo and S in the same areas
as illustrated in fig 11.