The Plexidor Locking Cover
has always been one of the best but it was hard to use. You had to fit the steel cover over four bolts and then manually tighten nuts on the bolts. Too much trouble unless you were leaving on vacation.
Now, Plexidor has developed a special steel track set that bolts to the pet door and accepts the locking cover. Just slide it down the track from the top and engage two locks at the top of each track. Quick and easy!
If you intend to use the Plexidor locking cover then getting the track set for it is essential.
Plexidor Sliding Track Installation Instructions
1. Line up the Sliding tracks with your Plexidor
2. Use a screwdriver to attach the sliding tracks to the interior frame
3. Make sure the steel security plate slides over the tracks