Shown below is a saddle type threshold. It can be used by itself or with
a door sweep if you want to provide a seal with the door and threshold.
The bumper threshold provides a seal and threshold in one piece. The seal can be vinyl, neoprene, or
silicone.
A door sweep can be used alone or with a saddle threshold like the one above. Shown below are 2 variations...the 307AV on
the left and the 315CN on the right.