The only difference is the springs, we use our own spring for AP200 and Wessex blues for the AP250.
The box section of the arm is the best way to determine the difference. The AP150 box section is 1½” x ¾” and the AP200 box section is 2″ x 1″.
Yes it is, but if you aren’t sure, short arm gears will fit both standard and short height doors, but a standard won’t fit a short. So if you are unsure always go for a short arm.
If the door has blue springs use our AP250 gear. If the door has yellow springs you would need to use our AP350 gear.
