DBI dutter is a version of the Norwegian word duppeditter or dubbeditter, which in English is contraption, doodad, doohickey, gadget, gizmo, thingamabob, widget, or thingamajig. However, there is a proper word for stopping ends on a tube in English, which seems to be what you are looking for here. That word is end-caps. So you can translate the word as is, or the intention of the word, unless this is to be considered a proper noun because the company took a regular noun and abbreviated it and made it into a product name, which might be the case in this situation.