Yup, the next item in my exhaust system is also nearly clogged too... at least the opening right where the exhaust hose from the engine enters it is rather clogged.

I can put my finger in the opening, but just barely... so there is about 1/2 of an inch diameter or so of an opening... seems a bit narrow to me.

I found the vetus site, but their catalog seems to be in German.

I suppose I could try to chisel this clean, but this is a plastic box and I suspect that the plastic is not nearly as strong as the "rocks" that have formed in the inlet opening.

Thanks in advance.