My FlowStop seems too wide, is this normal ?
At the production we add between 0.3 and 1 inch of width except joints because it is absolutely necessary to be slightly wider than slightly less.
At the time of inflation the air fills completely your opening and the joints are crushed by the pressure of the air, it is what ensures the sealing.
When you install them, you pre-inflate the top cushion.
When placing it in your opening, do not hesitate to force it in.
L'air prend The air then takes up all the space.
Width out of opening
Width in opening