Larson Single Spline Door Sweep Expander for Storm Door 

Larson or Pella Storm door sweep with Single Fin
Single Vinyl Fin, Sweep slides into Bottom Storm Door Expander

Application: Storm door bottom sweep
Length: 36 inch
Color: Black

Note: This slides into the bottom of the metal expander on bottom of storm door. Cut to length as needed with razor knife or scissors. May be helpful to pinch the end to keep sweep from moving after installation.

Note 2: If difficult to slide vinyl into expander, use a little dish soap to lubricate. If vinyl is rigid, leave in a warm room till it softens or use a hair dryer.