I really don't know, just heard it called a 'deck pipe'. (years ago)Before we (family business) got into big generators (progressed from marine generators) we were a marine supply store. There was a lot of junk left over from a moving sale that's slowly being depleted to other uses. Of course I went through those few boxes and retrieved whatever I thought might be valuable. The deck pipe was in there. I like it. It works. I know the West Marine/Boat US/et.al. have round deck pipes with caps on them for just such a use. But I like mine. ;D