DownWest
Well-Known Member
Don't you cut the hole to the size, then insert the 'plug' and tighten up the screws to squeeze the rubber so it seals against the edge of the hole? Try doing them up out and you should see it bulge .Vetus ILT120 Have purchased, but cant work out what to do with the rubber seal. Watched the youtube and not shown at all, instructions no clearer. Any help please. Do I remove the 4 screws and disassemble it