Choose: 1 1/8" tall for installing into an 1/8" thick trailer roof
Choose: 2 1/4" tall for installing into an insulated or double trailer roof
The trim piece snaps up inside the vent and hides the pop rivets or screws. You may have to grind the screw tips & apply a little glue or sealant first. Looks professional and smooths and finishes the trailer ceiling. Fits both the steel and aluminum two-way HIGH PROFILE roof vents.